苏州混凝土水泥制品研究院有限公司

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发布时间:2020-01-06 00:00:00
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杂志简介

主办单位: 苏州混凝土水泥制品研究院
中国混凝土与水泥制品协会
  • 主编 : 俞锋
  • 常务副主编 : 王春蓉
  • 刊期 : 月刊
  • 电话 : 0512-68285716
  • E-mail : sccpitg@126.com
  • 国内统一刊号(CN) : 32-1173/TU
  • 国际标准刊号(ISSN) : 1000-4637
  • 邮发代号 : 28-80
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编者按

“混凝土耐久性:裂缝控制与修补”专刊
“混凝土耐久性:裂缝控制与修补”专刊
2024年第12期
摘要
引用本文
     【编者按】 随着我国经济的快速发展,既有、新建建筑和基础设施的体量愈来愈大,受服役环境影响,考虑其在设计、施工、服役阶段的耐久性能对于保证人们的生命财产安全、实现可持续发展具有重要意义。尤其是在服役阶段,由于外力、环境等因素的影响,大量混凝土结构在未达到设计使用年限时便出现了或大或小的耐久性问题。同时,为助力我国“双碳”目标实现,近年来大量建筑垃圾、工业固废被广泛用作建筑材料,而目前有关此类混凝土结构的长期耐久性能尚缺乏实际工程案例评价。       鉴于此,值此《混凝土与水泥制品》创刊50周年之际,我刊面向行业积极组稿,围绕“混凝土耐久性:裂缝控制与修补”这一主题进行系列报道,旨在介绍该领域的最新研究与应用进展,助力“双碳”目标实现,为混凝土行业的健康可持续发展锦上添花。本专刊包含22篇论文,涵盖材性研究、裂缝修补技术、施工技术、裂缝预测与监测及抗裂混凝土相关性能、应用等方面。衷心感谢为本专刊提供高水平论文的各位专家学者以及为本专刊辛勤付出的各位审稿专家和编辑,希望本专刊的内容可以为混凝土裂缝控制与修补的研究与应用提供借鉴,助力行业的低碳、高质量发展。       关键词:混凝土;耐久性能;抗裂性能;原材料;配合比;施工技术;裂缝预测;裂缝监测 Special Issue on Durability of Concrete: Crack Control and Repair      [Editors Note] With the rapid development of China’s economy, the volume of existing and newly built buildings and infrastructure is increasing. Due to the impact of the service environment, considering their durability in the design, construction, and service stages is of great significance for ensuring people’s life and property safety and achieving sustainable development. Especially during the service stage, due to external forces, environmental factors, and other factors, a large number of concrete structures experience varying degrees of durability issues before reaching their designed service life. At the same time, in order to help achieve China’s "Carbon Peaking and Carbon Neutrality" goals, a large amount of construction waste and industrial solid waste have been widely used as building materials in recent years. However, there is currently a lack of practical engineering case evaluations on the long-term durability of such concrete structures.       In view of this, on the occasion of the 50th anniversary of the founding of "China Concrete and Cement Products", we actively solicits contributions from the industry, focusing on the theme of "Durability of Concrete: Crack Control and Repair" for a series of reports. The aim is to introduce the latest research and application progress in this field, help achieve the "Carbon Peaking and Carbon Neutrality" goal, and add icing on the cake for the healthy and sustainable development of the concrete industry. This special issue includes 22 papers, covering aspects such as material properties research, crack repair technology, construction technology, crack prediction and monitoring, as well as the performance and application of crack resistant concrete. Sincere thanks to all the experts and scholars who have provided high-level papers for this special issue, as well as the reviewers and editors who have worked hard for this special issue. We hope that the content of this special issue can provide reference for the research and application of concrete crack control and repair, and help promote the low-carbon and high-quality development of the industry.       Keywords: Cconcrete; Durability; Crack resistance; Raw material; Mix proportion; Construction technology; Crack prediction; Crack monitoring

《混凝土与水泥制品》首届青年编委名单

材性研究

高低温环境下混凝土有机-无机复合抗裂养护剂的制备及性能研究
高低温环境下混凝土有机-无机复合抗裂养护剂的制备及性能研究
  • 吉久发1,叶梦煊2,曹志国1,谷雷雷1,王倩倩2,*
2024年第12期
摘要
引用本文
摘   要:制备了适用于高低温环境的混凝土有机-无机复合抗裂养护剂(OICCA养护剂),研究了其对混凝土保水性能、力学性能及耐久性能的影响,并与两种市售养护剂(E-201、TSD)进行了对比,分析了其作用机理。结果表明:在40 ℃高温和-8 ℃低温环境下,与未涂覆养护剂的空白组相比,涂覆OICCA养护剂试件的抗裂性能显著提高;涂覆养护剂有效提高了混凝土的保水性能、力学性能及耐久性能;与E-201、TSD养护剂相比,OICCA养护剂的养护效果总体上相对较好;OICCA养护剂中的有机组分能使其成膜效果较好,无机组分能与水泥水化产物反应生成结晶物质密实孔隙,二者协同作用提升了混凝土的性能。 A concrete organic-inorganic composite anti-cracking curing agent(OICCA curing agent) suitable for high and low temperature environments was prepared. Its effects on the water retention, mechanical properties, and durability of concrete were studied, and compared with two commercially available curing agents(E-201, TSD) to analyze their mechanisms of action. The results show that under high temperature of 40 ℃ and low temperature of -8 ℃, compared with the blank group without coating curing agent, the crack resistance of OICCA curing agent coated specimens is significantly improved. The application of curing agents effectively improves the water retention, mechanical properties, and durability of concrete. Compared with E-201 and TSD curing agents, OICCA curing agent has a relatively better overall curing effect. The organic components in OICCA curing agent can achieve better film-forming effect, while the inorganic components can react with cement hydration products to form crystalline substances and compact pores. The synergistic effect of the two enhances the performance of concrete.
吉久发,叶梦煊,曹志国,等.高低温环境下混凝土有机-无机复合抗裂养护剂的制备及性能研究[J].混凝土与水泥制品,2024(12):1-8. JI J F,YE M X,CAO Z G,et al.Preparation and performance study of organic-inorganic composite anti-cracking curing agent for concrete in high and low temperature environments[J].China Concrete and Cement Products,2024(12):1-8.
水化热抑制剂对水泥-粉煤灰-矿粉复合胶凝材料水化反应的影响
水化热抑制剂对水泥-粉煤灰-矿粉复合胶凝材料水化反应的影响
  • 温东昌1,曾柯林1,杨 蓉2,王雷冲2,肖勋光2
2024年第12期
摘要
引用本文
摘   要:通过改变粉煤灰在矿物掺合料中的占比和水化热抑制剂(TRI)掺量,研究了TRI对水泥-粉煤灰-矿粉复合胶凝材料(复合胶材)水化过程和力学性能的影响,并通过测试TRI的吸附性能分析了其影响机理。结果表明:水泥对TRI的吸附能力最强,TRI虽能显著降低复合胶材早期水化放热速率峰值而不影响最终的水化程度,但会降低复合胶材的早期抗压强度;矿粉对TRI的吸附能力最弱,TRI对矿粉早期水化和火山灰反应的影响较小,且不影响其最终水化;粉煤灰对TRI的吸附能力相对较强,且TRI会严重影响粉煤灰的水化。 Abstract: The influence of hydration heat inhibitor(TRI) on the hydration process and mechanical properties of cement fly ash mineral powder composite cementitious materials(composite cementitious materials) was studied by changing the proportion of fly ash in mineral admixtures and the content of TRI added. The influence mechanism was analyzed by testing the adsorption performance of TRI. The results show that cement has the strongest adsorption capacity for TRI, which can significantly reduce the peak hydration heat release rate of composite cementitious materials in the early stage without affecting the final hydration degree, but will reduce the early compressive strength of composite cementitious materials. The adsorption capacity of mineral powder for TRI is the weakest, and TRI has little effect on the early hydration and volcanic ash reaction of mineral powder, and does not affect its final hydration. Fly ash has a relatively strong adsorption capacity for TRI, and TRI seriously affects the hydration of fly ash.
温东昌,曾柯林,杨蓉,等.水化热抑制剂对水泥-粉煤灰-矿粉复合胶凝材料水化反应的影响[J].混凝土与水泥制品,2024(12):9-13,28. WEN D C,ZENG K L,YANG R,et al.Effect of hydration heat inhibitor on the hydration reaction of composite cementitious materials with cement-fly ash-mineral powder[J].China Concrete and Cement Products,2024(12):9-13,28.
轻骨料预湿度对轻质UHPC性能及微观结构的影响
轻骨料预湿度对轻质UHPC性能及微观结构的影响
  • 鄢亦斌1,2,刘开志1,2,*,高立强1,2,彭嘉华1,2,郭凯正1,2,李 晨1,2
2024年第12期
摘要
引用本文
摘   要:研究了黏土陶砂预湿度(预湿水量分别为0、17.1、34.2 kg/m3)对轻质超高性能混凝土(LUHPC)工作性、力学性能、体积稳定性、抗氯离子渗透性能、抗盐雾侵蚀性能、抗低温性能和抗冻性能的影响,并分析了微观机理。结果表明:对黏土陶砂进行适当的预湿处理有助于改善LUHPC的工作性、力学性能、体积稳定性能、抗氯离子渗透性能、抗盐雾侵蚀性能、抗低温性能和抗冻性能;黏土陶砂预湿处理对LUHPC性能的提升主要归因于其优化了界面过渡区及改善了C-S-H凝胶结构。 Abstract: The effects of the pre-wetting degree of clay ceramic sand(pre-wetting water content was 0, 17.1 kg/m3, and 34.2 kg/m3, respectively) on the workability, mechanical property, volume stability, chloride ion penetration resistance, salt spray corrosion resistance, low temperature resistance, and frost resistance of lightweight ultra-high performance concrete (LUHPC) were investigated, and the micro-mechanisms were analyzed. The results show that, appropriate pre-wetting treatment of clay ceramic sand can help to improve the workability, mechanical property, volume stability, chlorine ion penetration resistance, salt spray corrosion resistance, low temperature resistance and frost resistance of LUHPC. The enhancement of LUHPC performance by the pre-wetting treatment of clay ceramic sand is attributed to the optimization of the interfacial transition zone and the improvement of the C-S-H gel structure.
鄢亦斌,刘开志,高立强,等.轻骨料预湿度对轻质UHPC性能及微观结构的影响[J].混凝土与水泥制品,2024(12):14-21. YAN Y B,LIU K Z,GAO L Q,et al.Effects of pre-wetting degree of lightweight aggregate on performance and microstructure of lightweight UHPC[J].China Concrete and Cement Products,2024(12):14-21.
SAP内养护再生粗骨料自密实混凝土的性能研究
SAP内养护再生粗骨料自密实混凝土的性能研究
  • 黄英杰1,张 萌1,*,曹建青2,甘诗腾1,刘睿智1,温 勇1
2024年第12期
摘要
引用本文
摘   要:研究了SAP掺量、再生粗骨料(RCA)取代率对自密实混凝土(SCC)工作性、力学性能和收缩性能的影响规律。结果表明:SAP对SCC工作性的影响不大,而RCA取代率对SCC工作性的影响较大;当SAP掺量一定时,SCC的坍落扩展度随RCA取代率的增加而降低;当SAP掺量一定时,SCC的抗压强度、劈裂抗拉强度随RCA取代率的增加而降低;当RCA取代率为75%、100%时,SCC的抗压强度、劈裂抗拉强度相对接近;SCC的劈裂抗拉强度发展速率随RCA取代率的增加而降低;与对照组相比,掺SAP及RCA的SCC的28 d自收缩均有显著降低;当SAP掺量一定时,SCC的自收缩随着RCA取代率的增加而降低;当RCA取代率一定时,SCC的自收缩基本随着SAP掺量的增加而降低。 Abstract: The influence of SAP dosage and recycled coarse aggregate(RCA) substitution rate on the workability, mechanical properties, and shrinkage performance of self-compacting concrete(SCC) was studied. The results show that SAP has little effect on the workability of SCC, while RCA substitution rate has a greater impact on SCC workability. When the SAP dosage is constant, the slump expansion of SCC decreases with the increase of RCA substitution rate. When the SAP dosage is constant, the compressive strength and splitting tensile strength of SCC decrease with the increase of RCA substitution rate. When the RCA substitution rate is 75% and 100%, the compressive strength and splitting tensile strength of SCC are relatively close. The development rate of splitting tensile strength of SCC decreases with the increase of RCA substitution rate. Compared with the control group, the 28 d self-shrinkage of SCC doped with SAP and RCA is significantly reduced. When the SAP  dosage is constant, the self-shrinkage of SCC decreases with the increase of RCA substitution rate. When the RCA substitution rate is constant, the self-shrinkage of SCC basically decreases with the increase of SAP dosage.
黄英杰,张萌,曹建青,等.SAP内养护再生粗骨料自密实混凝土的性能研究[J].混凝土与水泥制品,2024(12):22-28. HUANG Y J,ZHANG M,CAO J Q,et al.Study on the performance of SAP internal curing recycled coarse aggregate self-compacting concrete[J].China Concrete and Cement Products,2024(12):22-28.
膨胀剂对复掺粉煤灰及矿粉自密实混凝土性能的影响
膨胀剂对复掺粉煤灰及矿粉自密实混凝土性能的影响
  • 杨舜太1,吕永进2,杨 俊3,贺 勇1,*,王 聪3
2024年第12期
摘要
引用本文
摘   要:研究了膨胀剂掺量(0、8%、10%、12%)对复掺粉煤灰及矿粉自密实混凝土工作性、力学性能、体积稳定性和耐久性能的影响,并分析了作用机理。结果表明:膨胀剂的掺入降低了自密实混凝土的扩展度,当膨胀剂掺量在8%~12%范围内时,其对自密实混凝土扩展度的影响较小;掺入适量膨胀剂能有效提高自密实混凝土的抗压强度和限制膨胀率,降低干燥收缩值、碳化深度和电通量;膨胀剂能与水反应,生成膨胀性结晶水化物钙矾石,适量可提高基体的密实度,补偿混凝土硬化过程中的收缩。 Abstract: The effect of the content of expansion agent(0, 8%, 10% and 12%) on the workability, mechanical property, volume stability and durability of self-compacting concrete mixed with fly ash and slag was investigated, and the action mechanism was analyzed. The results show that, the incorporation of expansion agent reduces the slump-flow of self-compacting concrete, and when the content of expansion agent is 8%~12%, it has small effect on the slump-flow of self-compacting concrete. The incorporation of appropriate content of expansion agent can effectively improve the compressive strength and restricted expansion rate, and reduce the drying shrinkage value, carbonation depth and electric flux of self-compacting concrete. Expansion agent can react with water and generate expansive hydration product ettringite, which improves the matrix compactness and compensates the shrinkage of concrete during hardening.
杨舜太,吕永进,杨俊,等.膨胀剂对复掺粉煤灰及矿粉自密实混凝土性能的影响[J].混凝土与水泥制品,2024(12):29-32,46. YANG S T,LYU Y J,YANG J,et al.Effect of the expansion agent on the performance of self-compacting concrete mixed with fly ash and slag[J].China Concrete and Cement Products,2024(12):29-32,46.
水泥-石灰石粉胶凝材料体系水化放热规律研究
水泥-石灰石粉胶凝材料体系水化放热规律研究
  • 朱鹏飞1,2,余 熠1,*,石研然1,徐 菲1,何 旸1,蒋林华2,储洪强2,徐 宁1,徐天磊1
2024年第12期
摘要
引用本文
摘   要:研究了石灰石粉细度(比表面积分别为218、448、596 m2/kg)、水胶比(0.40、0.45、0.50)、水化温度(20 ℃、40 ℃)对胶凝材料体系水化进程的影响,并分析了石灰石粉的作用机理。结果表明:在20 ℃水化温度下,石灰石粉发挥填充、稀释、成核效应,随着石灰石粉掺量的增加,胶凝材料体系的水化放热速率峰值不断降低,诱导期结束时间基本提前;适当降低石灰石粉细度能促进胶凝材料体系的水化进程,但降低水胶比则起相反作用;适当升高水化温度可有效激发石灰石粉的水化活性,加速其火山灰效应,促进胶凝材料体系的水化进程。 Abstract: The effects of the fineness of limestone powder(specific surface area of 218, 448, 596 m2/kg, respectively), the water-binder ratio(0.40, 0.45, 0.50), and the hydration temperature(20 ℃, 40 ℃) on the hydration process of the cementitious material system were investigated, and the mechanism of the limestone powder was analyzed. The results show that, under the hydration temperature of 20 ℃, limestone powder plays the filling effect, dilution effect and nucleation effect, with the increase of the content of limestone powder, the peak value of the hydration exothermic rate of the cementitious material system decreases, and the terminal time of the induction period is basically in advance. Appropriate reduction of limestone powder fineness can promote the hydration process of cementitious material system, but reducing the water-binder ratio works in the opposite way. Appropriately elevating the hydration temperature can effectively stimulate the hydration activity of limestone powder, accelerate its volcanic ash effect, and promote the hydration process of cementitious material system.
朱鹏飞,余熠,石研然,等.水泥-石灰石粉胶凝材料体系水化放热规律研究[J].混凝土与水泥制品,2024(12):33-36. ZHU P F,YU Y,SHI Y R,et al.Study on the hydration exothermic law of cement-limestone powder cementitious material system[J].China Concrete and Cement Products,2024(12):33-36.
全固废超硫酸盐水泥稳定基层的配合比设计及施工过程质量控制
全固废超硫酸盐水泥稳定基层的配合比设计及施工过程质量控制
  • 王梦梦1,魏 力2,贾小龙1,3,4,李瑞杰2,5,万 磊3,陈浩旭3,4,马旭东3,4
2024年第12期
摘要
引用本文
摘   要:设计了全固废超硫酸盐水泥稳定材料的配合比,研究了其力学性能和耐久性能,并与水泥稳定材料进行了对比,提出了适用的施工过程质量控制方法。结果表明:制备的全固废超硫酸盐水泥稳定材料的无侧限抗压强度、抗压回弹模量、弯拉强度和间接抗拉强度均与水泥稳定材料的相当,抵抗干燥收缩的性能显著优于水泥稳定材料,这有利于实际工程中的裂缝控制;推荐采用硫酸盐SO3含量进行全固废超硫酸盐水泥稳定材料的施工过程质量控制。 The mix proportion of fully solid waste super sulfate cement stabilized material was designed, and its mechanical and durability properties were studied and compared with cement stabilized materials. Suitable construction process quality control methods were proposed. The results show that the unconfined compressive strength, compressive rebound modulus, flexural tensile strength, and indirect tensile strength of the prepared fully solid waste super sulfate cement stabilized material are comparable to those of cement stabilized material, and the resistance to drying shrinkage is significantly better than that of cement stabilized material, which is beneficial for crack control in practical engineering. It is recommended to use SO3 content in sulfate for construction process quality control of fully solid waste super sulfate cement stabilized materials.
王梦梦,魏力,贾小龙,等.全固废超硫酸盐水泥稳定基层的配合比设计及施工过程质量控制[J].混凝土与水泥制品,2024(12):37-41. WANG M M,WEI L,JIA X L,et al.Mix proportion design and construction process quality control of fully solid waste super sulfate cement stabilized base[J].China Concrete and Cement Products,2024(12):37-41.
污水处理池用大体积混凝土抗裂技术研究与应用
污水处理池用大体积混凝土抗裂技术研究与应用
  • 陈璋勇1,马 安1,汪 洋2
2024年第12期
摘要
引用本文
摘   要:为解决南通某污水处理池大体积混凝土易开裂的问题,通过优化配合比、掺入适量抗裂剂等措施设计了抗裂混凝土,研究了抗裂混凝土的抗压强度、绝热温升、自生体积变形,并对实体结构混凝土进行了现场温度、变形监测。结果表明:掺入适量抗裂剂并适当降低水泥用量能有效改善混凝土的绝热温升和自生体积变形,且对抗压强度无太大影响;监测段混凝土各结构部位的温峰在41.6~42.1 ℃范围内,最大温升值在21.2~22.1 ℃范围内,混凝土里表温差最大值为5.8 ℃;混凝土各结构部位的变形表现为持续膨胀;在整个监测期内,监测段混凝土未出现开裂。 Abstract: In order to solve the problem of easy cracking of mass concrete in a sewage treatment pond in Nantong, anti-cracking concrete was designed by optimizing the mix proportion and adding appropriate content of anti-cracking agent. The compressive strength, adiabatic temperature rise, and self-generated volumetric deformation of the anti-cracking concrete were investigated, and the temperature and deformation of the solid structural concrete were monitored on-site. The results show that, adding appropriate content of anti-cracking agent and appropriately reducing the content of cement can effectively improve the adiabatic temperature rise and self-generated volumetric deformation of concrete, and there is no great influence on the compressive strength. The peak temperature of each structural part of the concrete of the monitored section is in the range of 41.6~42.1 ℃, and the maximum value of temperature rise is in the range of 21.2~22.1 ℃, and the maximum value of temperature difference between the surface and the interior of the concrete is 5.8 ℃. The deformation of all structural parts of the concrete exhibits continuous expansion. Throughout the monitoring period, there is no occurrence of cracks in the concrete of the monitored section.
陈璋勇,马安,汪洋.污水处理池用大体积混凝土抗裂技术研究与应用[J].混凝土与水泥制品,2024(12):42-46. CHEN Z Y,MA A,WANG Y.Research and application of anti-cracking technology of mass concrete for sewage treatment pool[J].China Concrete and Cement Products,2024(12):42-46.
补偿收缩混凝土在某大型明挖穿湖隧道工程中的应用研究
补偿收缩混凝土在某大型明挖穿湖隧道工程中的应用研究
  • 王德民1,宋长清2,姚 军2,朱国军1,辜振睿1,舒震林1,张 港1
2024年第12期
摘要
引用本文
王德民,宋长清,姚军,等.补偿收缩混凝土在某大型明挖穿湖隧道工程中的应用研究[J].混凝土与水泥制品,2024(12):47-50. WANG D M,SONG C Q,YAO J,et al.Application research of shrinkage-compensating concrete in a large open-cut lake-crossing tunnel project[J].China Concrete and Cement Products,2024(12):47-50.
蒸养混凝土损伤及改善措施研究综述
蒸养混凝土损伤及改善措施研究综述
  • 金清平1,陈 祺1,刘 勇2,高永红1,张 曼2
2024年第12期
摘要
引用本文
摘   要:总结了蒸养混凝土的收缩开裂、热损伤、延迟钙矾石形成三种典型损伤类型,分析了损伤作用机理。并提出了改善蒸养混凝土损伤的措施:适量掺入矿物掺合料、优化蒸养制度、合理的后续补充养护、适量掺入内养护材料SAP等。 Abstract: Three typical types of damage, namely shrinkage cracking, thermal damage, and delayed formation of ettringite in steam curing concrete are summarized. The damage mechanism is analyzed, and improvement measures for steam curing concrete damage are proposed. Moderate addition of mineral admixtures, optimization of steam curing system, reasonable subsequent supplementary curing, and appropriate addition of internal curing material SAP can all improve the damage of steam curing concrete to a certain extent.
金清平,陈祺,刘勇,等.蒸养混凝土损伤及改善措施研究综述[J].混凝土与水泥制品,2024(12):51-56. JIN Q P,CHEN Q,LIU Y,et al.Current status on damage of steam curing concrete and its improvement measures[J].China Concrete and Cement Products,2024(12):51-56.

裂缝修补技术

二元微生物混凝土裂缝自修复材料的制备及性能研究
二元微生物混凝土裂缝自修复材料的制备及性能研究
  • 郑新国1,2,刘 竞1,2,郁培云1,2,李书明1,2,*,张 磊3,李嘉璇3
2024年第12期
摘要
引用本文
摘   要:制备了基于巴氏芽孢杆菌和胶质芽孢杆菌的二元微生物混凝土裂缝自修复材料,研究了巴氏芽孢杆菌和胶质芽孢杆菌体积比(混合比例10∶0、8∶2、6∶4、4∶6、2∶8、0∶10)对微生物的生长规律、矿化效果等的影响,并对自修复材料的裂缝修复效果进行了测试。结果表明:当混合比例为6∶4时,细菌浓度最高,CaCO3沉淀量最大,产生的方解石结晶度最好,砂浆试件的裂缝修复率最高。 Abstract: A dual microbial concrete crack self-healing material based on Bacillus subtilis and Bacillus mucilaginosus was prepared. The effects of the volume ratios of Bacillus subtilis and Bacillus mucilaginosus(mixing ratios of 10∶0, 8∶2, 6∶4, 4∶6, 2∶8, 0∶10) on microbial growth patterns, mineralization effects, etc. were studied, and the crack repair effect of the self-healing material was tested. The results show that when the mixing ratio is 6∶4, the bacterial concentration is the highest, the CaCO3 precipitation is the largest, the resulting calcite crystallinity is the best, and the crack repair rate of the mortar specimen is the highest. 
郑新国,刘竞,郁培云,等.二元微生物混凝土裂缝自修复材料的制备及性能研究[J].混凝土与水泥制品,2024(12):57-63. ZHENG X G,LIU J,YU P Y,et al.Preparation and performance study of dual microbial concrete crack self-healing material[J].China Concrete and Cement Products,2024(12):57-63.
混凝土裂缝修复技术的研究现状及进展
混凝土裂缝修复技术的研究现状及进展
  • 李文静,贾苍琴*,王贵和,向雅然
2024年第12期
摘要
引用本文
摘   要:介绍了传统混凝土裂缝修复技术和新兴微生物诱导碳酸钙沉淀(MICP)技术的研究进展,从修复材料和工艺上进行了总结与评价,并从裂缝宽度、抗压强度、抗渗性能方面分析了MICP技术修复混凝土裂缝的效果,总结了MICP技术存在的问题,最后展望了其发展趋势,指出了该技术进一步的研究方向。 Abstract: The research progress of traditional concrete crack repair technology and emerging microbial induced calcium carbonate precipitation (MICP) technology is introduced. The repair materials and processes are summarized and evaluated, and the effect of MICP technology on repairing concrete cracks is analyzed from the aspects of crack width, compressive strength, and impermeability. The problems of MICP technology are summarized, and its development trend is predicted. The further research directions of MICP technology are also pointed out.
李文静,贾苍琴,王贵和,等.混凝土裂缝修复技术的研究现状及进展[J].混凝土与水泥制品,2024(12):64-69. LI W J,JIA C Q,WANG G H,et al.Research status and development of concrete crack repair technology[J].China Concrete and Cement Products,2024(12):64-69.
高黏结低收缩砂浆在船闸闸室墙面层修复中的应用
高黏结低收缩砂浆在船闸闸室墙面层修复中的应用
  • 王 锐1,杨 虎2,3,*,蔡 明2,4,封佳蕊4,王 冬2,4,王 珩2,3,沈 航4
2024年第12期
摘要
引用本文
摘   要:针对传统聚合物砂浆在机械搅拌时黏结性能大幅下降、干缩率较高等缺点,制备了改性聚合物砂浆,对比研究了传统聚合物砂浆和改性聚合物砂浆在不同搅拌方式下的工作性、力学性能、变形性能及耐久性能,并将改性聚合物砂浆用在江苏省某船闸闸室墙修复试点工程中,对砂浆的强度、立面垂直度、表面平整度、黏结牢固程度进行了现场检查测试。结果表明:改性聚合物砂浆与基层间黏结牢固,结合层无脱层、空鼓等现象,整体修复效果较好。 Abstract: A modified polymer mortar was prepared to address the drawbacks of significantly reduced bonding performance and high dry shrinkage rate of traditional polymer mortar during mechanical mixing. The workability, mechanical properties, deformability, and durability of traditional polymer mortar and modified polymer mortar under different mixing methods were compared and studied. A pilot application of modified polymer mortar was carried out in a ship lock chamber wall repair project in Jiangsu Province, and the strength, vertical orientation, surface flatness, and bonding strength of mortar were inspected and tested on site. The results show that the bonding between the modified polymer mortar and the base layer is firm, and there is no delamination or hollowing in the bonding layer, indicating a good overall repair effect.
王锐,杨虎,蔡明,等.高黏结低收缩砂浆在船闸闸室墙面层修复中的应用[J].混凝土与水泥制品,2024(12):70-73,77. WANG R,YANG HCAI M,et al.Application of high bonding and low shrinkage mortar in repairing the surface layer of lock chamber wall[J].China Concrete and Cement Products,2024(12):70-73,77.
自修复混凝土的分类及研究进展
自修复混凝土的分类及研究进展
  • 徐文涛,姬栋宇
2024年第12期
摘要
引用本文
摘   要:混凝土的自修复是混凝土在一定外部和内部条件下,通过新物质的生成或者其他方式,自行封闭、愈合裂缝的过程。总结了目前常用的混凝土自修复方法及各自的优缺点,可为混凝土自修复技术的应用提供参考。 Abstract: The self-healing of concrete refers to the process of concrete self-healing and healing cracks through the generation of new substances or other ways under certain external and internal conditions. The commonly used concrete self-healing methods and their respective advantages and disadvantages are summarized, which can provide reference for the application of concrete self-healing technology.
徐文涛,姬栋宇.自修复混凝土的分类及研究进展[J].混凝土与水泥制品,2024(12):74-77. XU W T,JI D Y.Classification and research progress of self-healing concrete[J].China Concrete and Cement Products,2024(12):74-77.

施工技术研究

贵州花江峡谷大桥重力锚基础大体积混凝土温控技术研究
贵州花江峡谷大桥重力锚基础大体积混凝土温控技术研究
  • 周 毅1,2,3,陈露一1,2,3,蔡 昱1,2,3,黄有强1,2,3,李 天1,2
2024年第12期
摘要
引用本文
摘   要:依托贵州花江峡谷大桥重力锚基础工程,采用优化配合比、布置冷却水管、调整混凝土养护制度等措施控制大体积混凝土的温度,采用Midas Civil软件预测了大体积混凝土的温度和应力发展趋势,并通过现场温度监测验证了温控措施的可行性。结果表明:重力锚基础大体积混凝土的温度峰值和里表温差均满足相关标准要求,且现场温度监测结果与仿真计算结果接近;重力锚基础大体积混凝土现场施工时未出现温度裂缝,采取的温控措施切实有效。 Abstract: Based on the gravity anchor foundation project of Guizhou Huajiang Canyon Bridge, measures such as optimizing the mixing proportion, arranging cooling water pipes, and adjusting the concrete curing regimes were adopted to control the temperature of mass concrete, the Midas Civil software was adopted to predict the development trend of the temperature and stress of the mass concrete. And the feasibility of temperature control measures was verified through on-site temperature monitoring. The results show that, the peak temperature and temperature difference between inner and surface of the mass concrete for gravity anchor foundations meet the requirements of the relevant standards. And the on-site temperature monitoring results are close to the results of the simulation analysis. During the construction process, there is no temperature crack in the mass concrete for gravity anchor foundations, and the temperature control measures taken are effective.
周毅,陈露一,蔡昱,等.贵州花江峡谷大桥重力锚基础大体积混凝土温控技术研究[J].混凝土与水泥制品,2024(12):78-82. ZHOU Y,CHEN L Y,CAI Y,et al.Research on temperature control techniques for mass concrete of gravity anchorage foundation of Huajiang Canyon Bridge in Guizhou[J].China Concrete and Cement Products,2024(12):78-82.
C45P8大体积混凝土在某地标核心筒筏板基础中的应用
C45P8大体积混凝土在某地标核心筒筏板基础中的应用
  • 侯旭林1,赵 爽1,曾鲁平1,王 伟1,陈俊松1,赵 峰2
2024年第12期
摘要
引用本文
摘   要:依托某地标核心筒筏板基础大体积混凝土工程,在满足C45P8设计要求的前提下,通过原材料优选、配合比优化(降低胶凝材料用量、复掺矿物掺合料、优选外加剂种类)和施工技术调控(浇筑顺序、分层厚度、振捣工艺、养护制度等)来降低大体积混凝土的水化温升,降低开裂风险。结果表明:优选原材料、合理设计配合比,并辅以合适的施工技术措施,可使大体积混凝土的内、外温差小于25 ℃,满足大体积混凝土施工温控技术要求。 Abstract: Based on a landmark core raft foundation mass concrete project, while meeting the design requirements of C45P8, measures were taken to reduce the hydration temperature rise and the cracking risk of mass concrete through raw material selection, mix proportion optimization(reducing the amount of cementitious materials, adding mineral admixtures, optimizing the types of admixtures), and construction technology regulation(pouring sequence, layer thickness, vibration process, curing system, etc.). The results show that by optimizing raw materials, designing reasonable mix proportions, and supplementing with appropriate construction technology measures, the temperature difference between the inside and outside of mass concrete can be reduced to less than 25 ℃, which meets the temperature control technology requirements for mass concrete construction.
侯旭林,赵爽,曾鲁平,等.C45P8大体积混凝土在某地标核心筒筏板基础中的应用[J].混凝土与水泥制品,2024(12):83-86,92. HOU X L,ZHAO S,ZENG L P,et al.Application of C45P8 mass concrete in a landmark core raft foundation[J].China Concrete and Cement Products,2024(12):83-86,92.
水下混凝土结构填缝止水胶抗渗性能试验方法研究
水下混凝土结构填缝止水胶抗渗性能试验方法研究
  • 张景奎1,刘长顺1,罗居刚1,孔楠楠1,姚 亮1,彭建和1,许军才2
2024年第12期
摘要
引用本文
铁铝酸盐水泥混凝土异形构件施工技术研究
铁铝酸盐水泥混凝土异形构件施工技术研究
  • 邹德麟1,齐冬有2,邱开建3,向世文1,李长成2,张华英3,张 巍1,李春林4,张栩嘉3
2024年第12期
摘要
引用本文
摘   要:制备了铁铝酸盐水泥混凝土异形构件,研究了浇筑层数(2、3、4层)、振捣时间(10、20、30、40 s)和脱模时间(15、20、25 h)对构件外观质量和力学性能的影响。结果表明:随着浇筑层数的增加,构件的7 d回弹强度增大,且当浇筑层数为3层时,构件的外观质量最好;随着振捣时间的增加,构件的7 d回弹强度先增大后减小,且当振捣时间为20~30 s时,构件的外观质量较好;随着脱模时间的延长,构件的回弹强度增大,且当脱模时间为20~25 h时,构件的外观质量较好;综合考虑构件的外观质量、力学性能和模具周转频率,建议采用分3层浇筑、振捣时间为20~30 s和脱模时间20 h的施工技术。 Abstract: Ferro aluminate cement concrete irregular components were prepared, and the effects of pouring layer(2, 3, 4 layers), vibration time(10, 20, 30, 40 s), and demoulding time(15, 20, 25 h) on the appearance quality and mechanical properties of the components were studied. The results indicate that as the number of pouring layers increases, the 7 d rebound strength of the component increases, and when the number of pouring layer is 3, the appearance quality of the component is the best. As the vibration time increases, the 7 d rebound strength of the component first increases and then decreases, and when the vibration time is 20~30 s, the appearance quality of the component is good. With the extension of demoulding time, the rebound strength of the component increases, and when the demolding time is 20~25 h, the appearance quality of the component is good. Taking into account the appearance quality, mechanical properties, and mold turnover frequency of the components, it is recommended to adopt a construction technique of pouring layer of 3, vibration time of 20~30 s, and demoulding time of 20 h.
邹德麟,齐冬有,邱开建,等.铁铝酸盐水泥混凝土异形构件施工技术研究[J].混凝土与水泥制品,2024(12):93-97. ZOU D L,QI D Y,QIU K J,et al.Study on construction technology of ferro aluminate cement concrete irregular components[J].China Concrete and Cement Products,2024(12):93-97.

裂缝预测与监测

基于ABAQUS的地铁车站大体积混凝土温度影响因素研究
基于ABAQUS的地铁车站大体积混凝土温度影响因素研究
  • 曹玉新1,寇 帅2,霍曼琳2,*,王国义3,任少伟2,边 崇2,刘亚轩2
2024年第12期
摘要
引用本文
摘   要:依托成都地铁19号线二期工程双流机场2航站楼东站车站项目,利用ABAQUS软件建立了顶板混凝土温度场模型,研究了粉煤灰掺量(0、10%、20%、30%、40%、50%)、入模温度(10、15、20、25 ℃)、保温材料种类[土工布、聚苯乙烯板(以下简称EPS)、橡塑海绵]和保温层开始覆盖时间(0、20、30、40、50 h)对大体积混凝土温度场的影响,并优选出了较优组合控温方案。结果表明:在单因素作用下,混凝土试件的最大里表温差均低于25 ℃,满足相关规范要求,但内部降温速率均高于2.0 ℃/d;基于规范要求和实际工程项目施工条件,优选出的组合控温方案为粉煤灰掺量20%或30%、入模温度15 ℃、浇筑后30 h覆盖橡塑海绵。 Abstract: Based on the Chengdu Metro Line 19 Phase Ⅱ Shuangliu Airport Terminal 2 East Station project, the temperature field model of the roof concrete was established by using ABAQUS software, and the effects of fly ash content(0, 10%, 20%, 30%, 40%, 50%), casting temperature(10, 15, 20, 25 ℃), type of thermal insulation[geotextile fabrics, polystyrene boards (EPS), and rubber-plastic sponge] and starting time of insulation coverage(0, 20, 30, 40, 50 h) on the temperature field of mass concrete were investigated, and the better combination of temperature control program was preferred. The results show that, under the action of a single factor, the maximum value of temperature difference between the inside and outside of the concrete specimen is lower than 25 ℃, which meets the relevant specification requirements, but the internal cooling rate is higher than 2.0 ℃/d. Based on the specification requirements and the actual project construction conditions, the preferred combined temperature control program is as follows: the content of fly ash is 20% or 30%, the casting temperature is 15 ℃, and the rubber-plastic sponge is covered after pouring for 30 h.
曹玉新,寇帅,霍曼琳,等.基于ABAQUS的地铁车站大体积混凝土温度影响因素研究[J].混凝土与水泥制品,2024(12):98-104. CAO Y X,KOU S,HUO M L,et al.Study on the influencing factors of mass concrete temperature in subway station based on ABAQUS software[J].China Concrete and Cement Products,2024(12):98-104.
循环冲击荷载下水工混凝土损伤效应研究
循环冲击荷载下水工混凝土损伤效应研究
  • 李 芳1,郑永来2
2024年第12期
摘要
引用本文
摘   要:水工混凝土结构不仅要遭受船舶撞击荷载作用,而且长期处于海洋环境遭受氯盐腐蚀,导致混凝土结构内部损伤堆积。采用循环冲击荷载模拟船舶靠泊时的撞击力及撞击次数,采用超声波对混凝土损伤度进行量化,并用CT技术进行验证,建立了损伤度与氯离子扩散系数之间的定量关系。结果表明:应力水平存在一个临界值0.6,当应力水平超过0.6时,混凝土的损伤度显著增加;随着损伤度的增加,混凝土的使用寿命降低;损伤度的增加比氯离子侵蚀对混凝土使用寿命的影响更明显。 Abstract: Hydraulic concrete structures not only suffer from ship impact loads, but also suffer from long-term exposure to chloride corrosion in marine environments, resulting in internal damage accumulation of concrete structures. The impact force and number of impacts during ship berthing were simulated using cyclic impact loads. Ultrasonic waves were used to quantify the damage degree of concrete, and CT technology was used for verification. A quantitative relationship between damage degree and chloride ion diffusion coefficient was established. The results indicate that there is a critical value of 0.6 for stress level, and when the stress level exceeds 0.6, the damage degree of concrete significantly increases. As the degree of damage increases, the service life of concrete decreases. The increase in damage has more significant impact on the service life of concrete than chloride ion erosion.
李芳,郑永来.循环冲击荷载下水工混凝土损伤效应研究[J].混凝土与水泥制品,2024(12):105-109. LI F,ZHENG Y L.Research on damage effect of hydraulic concrete under cyclic impact load[J].China Concrete and Cement Products,2024(12):105-109.
大体积混凝土浇筑仓块不同边界温度及应变变化规律
大体积混凝土浇筑仓块不同边界温度及应变变化规律
  • 李 灿1,林 峰2,熊俊驰1,*,周殷弘2,刘宁宇3,余建国1
2024年第12期
摘要
引用本文
摘   要:为研究大体积混凝土浇筑后的温度及应变变化规律,结合某工业厂房大型设备基础混凝土温度及应变测量数据,研究了该大体积混凝土关键区域(仓块中心、边缘、边缘凹角)温度-应变的时变规律。结果表明:混凝土温度变化与边界导热速率有关,各区域因边界区别温度变化规律也存在差别;当边界为外界空气时,混凝土为自由约束,应变只与混凝土的膨胀收缩有关;当边界为相邻混凝土及地基时,混凝土为固定约束,且约束随混凝土表面与边界的连接情况而改变,混凝土膨胀时受压应力,收缩时受拉应力;边缘凹角为混凝土形状突变处,会产生大量集中应力,混凝土应变明显较其他区域更大。 Abstract: In order to study the temperature and strain changes of mass concrete after pouring, combined with the temperature and strain measurement datas of the foundation concrete of a large equipment in an industrial plant, the time-varying temperature strain law of the key areas(center, edge, edge concave angle) of the mass concrete was studied. The results indicate that the temperature change of concrete is related to the thermal conductivity rate at the boundary, and the temperature change pattern varies in different regions due to boundary differences. When the boundary is the external air, the concrete is a free constraint, and the strain is only related to the expansion and contraction of the concrete. When the boundary is adjacent concrete and foundation, the concrete is a fixed constraint, and the constraint changes with the connection between the concrete surface and the boundary. The concrete experiences compressive stress during expansion and tensile stress during contraction. The concave corner of the edge is where the shape of the concrete suddenly changes, which will generate a large amount of concentrated stress, and the concrete strain is significantly larger than other areas.
李灿,林峰,熊俊驰,等.大体积混凝土浇筑仓块不同边界温度及应变变化规律[J].混凝土与水泥制品,2024(12):110-114,119. LI C,LIN F,XIONG J C,et al.Variation laws of temperature and strain at different boundaries of mass concrete pouring blocks[J].China Concrete and Cement Products,2024(12):110-114,119.
多种工况对既有桥梁安全性的影响及相关解决方案
多种工况对既有桥梁安全性的影响及相关解决方案
  • 李 煌1,李 琪2,*,唐 甜2
2024年第12期
摘要
引用本文
摘   要:针对临近既有桥梁的后建工程在施工期间引起的河岸边地质条件变化,及其对桥梁造成的不利影响,通过分析桥梁观测点的位移量及沉降量,明确了影响既有桥梁稳定性的原因,指出了桥梁出现的主要病害,如桥墩顺桥偏移量较大、桥墩和桩基承载能力不足、桥墩开裂等,并设计了相应的维修加固方案。研究结果对评估河岸边后建工程对既有桥梁的影响及设计相应处置方案具有重要工程意义。 Abstract: In response to the geological changes along the riverbank caused by the construction of the adjacent post construction project of the existing bridge, as well as its adverse effects on the bridge, the reasons affecting the stability of the existing bridge are identified by analyzing the displacement and settlement of the bridge observation points. The main diseases of the bridge are pointed out, such as large displacement of the bridge piers along the bridge, insufficient bearing capacity of the bridge piers and pile foundations, and cracking of the bridge piers, and corresponding maintenance and reinforcement plans are designed. The research results have important engineering significance for evaluating the impact of subsequent riverbank projects on existing bridges and designing appropriate treatment plans.
李煌,李琪,唐甜.多种工况对既有桥梁安全性的影响及相关解决方案[J].混凝土与水泥制品,2024(12):115-119. LI H,LI Q,TANG T.Impact of multiple working conditions on safety of existing bridges and related solutions[J].China Concrete and Cement Products,2024(12):115-119.

新能源水泥基材料

钢纤维对海上风电灌浆料及灌浆连接段模型性能的影响研究
钢纤维对海上风电灌浆料及灌浆连接段模型性能的影响研究
  • 杨医博1,2,丁 成1,戚玉亮3,蔡慧妍1,黄梓铭1,黄华开1,郭文瑛1,王恒昌1
2024年第10期
摘要
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摘   要:开展了不同体积掺量的钢纤维对海上风电灌浆料以及小型灌浆连接段模型力学性能影响的研究。结果表明:当钢纤维掺量为1.0%时,能在保障灌浆料工作性和微膨胀性能的基础上,灌浆料的28 d抗折强度和抗压强度相较于未掺钢纤维时分别提高了65.4%和31.0%,且灌浆连接段模型的极限承载力和极限位移分别提高了12.0%和15.5%,有效提高了灌浆料的延性;灌浆连接段模型在轴心荷载作用下,主要受力和变形部位为内筒上部剪力键和外筒下部,在今后的灌浆连接段设计中,可对该部位进行适当加强,以便充分发挥灌浆连接段的整体性能。 Abstract: The influence of different volume content of steel fiber on the mechanical properties of offshore wind power grouting material and small grouting connection section model was studied. The results show that when the steel fiber content is 1.0%, the 28 d flexural strength and compressive strength of the grouting material can be increased by 65.4% and 31.0%, respectively, compared to the group without steel fiber, while ensuring the workability and micro expansion performance of the grouting material, and the ultimate bearing capacity and ultimate displacement of the grouting connection section model are improved by 12.0% and 15.5% respectively, which can effectively improve the ductility of the grouting material. Under the action of axial load, the main force and deformation parts are the shear bond of the upper part of the inner cylinder and the lower part of the outer cylinder. In the future grouting connection section design, this part can be appropriately strengthened to give full play to the overall performance of the grouting connection section.
杨医博,丁成,戚玉亮,等.钢纤维对海上风电灌浆料及灌浆连接段模型性能的影响研究[J].混凝土与水泥制品,2024(10):1-6,17. YANG Y B,DING C,QI Y L,et al.Study on the influence of steel fiber on the performance of offshore wind power grouting material and grouting connection section model[J].China Concrete and Cement Products,2024(10):1-6,17.
超高性能风电灌浆料的制备与性能试验研究
超高性能风电灌浆料的制备与性能试验研究
  • 庞伟琪1,张 宁1,汤 瑜1,秦广圣1,王长剑1,逄鲁峰2,白亚坤1
2024年第10期
摘要
引用本文
摘   要:制备了一种超高性能风电灌浆料,通过L16(44)正交试验研究了矿粉、石膏、硅灰、微珠对灌浆料性能的影响,并通过单因素试验研究了膨胀剂和缓凝剂对灌浆料性能的影响,确定了灌浆料的最佳配合比。结果表明:灌浆料的最佳配合比为水泥50%、矿粉2%、石膏3%、硅灰3%、微珠2%;粒径为0.125~0.212、0.212~0.425、0.425~0.850 mm石英砂占比分别为17%、11%、12%,减水剂掺量0.35%,消泡剂掺量0.03%,塑性膨胀剂掺量0.02%,SG掺量0.01%;工程应用表明,灌浆料的各项性能测试结果均满足施工要求,现场施工流动性良好,28 d抗折、抗压强度分别可达22.5 MPa、129.50 MPa,3 h膨胀率、3 h与24 h膨胀率之差分别为0.51%、0.20%。 Abstract: A ultra-high performance wind power grouting material was prepared, and the effects of mineral powder, gypsum, silica fume, and microbeads on the performance of the grouting material were studied through L16(44) orthogonal experiments. The effects of expansion agent and retarder on the performance of the grouting material were studied through single factor experiments, and the optimal mix proportion of the grouting material was determined. The results indicate that the optimal mix proportion for grouting material is 50% content of cement, 2% content of mineral powder, 3% content of gypsum, 3% content of silica fume, and 2% content of microbeads. The proportions of 0.125~0.212 mm, 0.212~0.425 mm, and 0.425~0.850 mm quartz sand are 17%, 11%, and 12%, respectively, water reducing agent content is 0.35%, defoamer content is 0.03%, plastic expansion agent content is 0.02%, and SG content is 0.01%. Engineering applications show that the performance test results of grouting materials meet the construction requirements, and the on-site construction fluidity is good. The 28 d flexural and compressive strength can reach 22.5 MPa and 129.50 MPa, respectively. The 3 h expansion rate and the difference between the 3 h and 24 h expansion rates are 0.51% and 0.20%, respectively.
庞伟琪,张宁,汤瑜,等.超高性能风电灌浆料的制备与性能试验研究[J].混凝土与水泥制品,2024(10):7-11,17. PANG W Q,ZHANG N,TANG Y,et al.Experimental study on preparation and performance of ultra-high performance wind power grouting material[J].China Concrete and Cement Products,2024(10):7-11,17.
海上风电塔筒用超高性能灌浆料的制备及性能研究
海上风电塔筒用超高性能灌浆料的制备及性能研究
  • 李庆超,李 伟,吉 飞,王可汗,孔祥法,郑春扬
2024年第10期
摘要
引用本文
摘   要:研究了硅灰掺量、石英砂级配、胶砂比、水胶比、外加剂掺量对海上风电塔筒用超高性能灌浆料工作性和力学性能的影响,并确定了最佳配合比。结果表明:灌浆料的最佳配合比为水胶比0.22、胶砂比1.0、石英砂级配m2.00~0.60 mm∶m0.60~0.28 mm∶m0.28~0.10 mm=54∶23∶23、硅灰掺量6%、复合膨胀剂掺量6%、消泡剂掺量0.10%、塑性膨胀剂掺量0.03%;在最佳配合比下,灌浆料的初始流动度为340 mm,30 min流动度为320 mm,1 d抗压强度为68.7 MPa,3 d抗压强度为94.2 MPa,28 d抗压强度为132.9 MPa,3 h竖向膨胀率为0.23%,24 h竖向膨胀率为0.27%。 Abstract: The effects of silica fume content, quartz sand gradation, cement sand ratio, water binder ratio, and admixture content on the workability and mechanical properties of ultra high performance grouting materials for offshore wind turbine tower were studied, and the optimal mix proportion was determined. The results show that the optimal mix proportion of grouting material is water binder ratio of 0.22, cement sand ratio of 1.0, the quartz sand grading is m2.00~0.60 mm∶ m0.60~0.28 mm∶m0.28~0.10 mm=54∶23∶23, silicon fume content of 6%, composite expansion agent content of 6%, defoamer content of 0.10%, plastic expansion agent content of 0.03%. At the optimal mix proportion, the initial flowability of the grouting material is 340 mm, the flowability at 30 min is 320 mm, the compressive strength at 1 d is 68.7 MPa, the compressive strength at 3 d is 94.2 MPa, the compressive strength at 28 d is 132.9 MPa, the vertical expansion rate at 3 h is 0.23%, and the vertical expansion rate at 24 h is 0.27%.
李庆超,李伟,吉飞,等.海上风电塔筒用超高性能灌浆料的制备及性能研究[J].混凝土与水泥制品,2024(10):12-17. LI Q C,LI W,JI F,et al.Study on preparation and performance of ultra high performance grouting materials for offshore wind turbine tower[J].China Concrete and Cement Products,2024(10):12-17.
负温环境下风电混塔拼接胶搅拌阻力、体积 稳定性研究
负温环境下风电混塔拼接胶搅拌阻力、体积 稳定性研究
  • 李博洋1a,1b,吴香国1a,1b,2,*,张明熠3,4,周瑞权3,4,刘忠岩1a,1b,*,王学振5,王建福6, 罗仕刚7,单 韧8
2024年第10期
摘要
引用本文
摘   要:节段胶拼技术随着预制装配式塔筒的发展,在风电混塔领域得到了广泛应用,且负温环境的混塔拼接缝的施工性能至关重要。研究了不同环氧树脂与固化剂含量比的环氧胶黏剂在负温(-5 ℃)环境下的施工性能,并提出了环氧胶黏剂搅拌阻力、体积稳定性的评价方法。结果表明:-5 ℃负温环境下,环氧胶黏剂具有较好的无约束线性收缩率,但搅拌阻力会有所增加。 Abstract: With the development of prefabricated tower structures, segmental splicing technology has made rapid progress in the field of wind power hybrid towers. The construction performance of hybrid tower splicing joints in negative temperature environments is crucial. The construction performance of epoxy adhesives with different ratios of epoxy resin to solidification agent content was studied under negative temperature(-5 ℃) environment, and evaluation methods for mixing resistance and volume stability of epoxy adhesives were proposed. The results show that the epoxy adhesive has a good unconstrained linear shrinkage rate in a negative temperature environment of -5 ℃, but the mixing resistance will increase.
李博洋,吴香国,张明熠,等.负温环境下风电混塔拼接胶搅拌阻力、体积稳定性研究[J].混凝土与水泥制品,2024(10):18-22. LI B Y,WU X G,ZHANG M Y,et al.Research on the mixing resistance and volume stability of splicing adhesive for wind power hybrid tower at low temperature[J].China Concrete and Cement Products,2024(10):18-22.
负温下风电混塔拼接胶的抗流挂性能和可工作时间研究
负温下风电混塔拼接胶的抗流挂性能和可工作时间研究
  • 李博洋1a,1b,吴香国1a,1b,2,*,张明熠3,4,周瑞权3,4,刘忠岩1a,1b,*,王学振5,王建福6, 罗仕刚7,单 韧8
2024年第10期
摘要
引用本文
摘   要:总结了结构拼接胶的研究现状,对比了现有相关标准对结构拼接胶的技术要求差异,研究了负温(-5 ℃)环境下4种风电混塔结构用拼接胶的抗流挂性能和可工作时间。结果表明:4种结构拼接胶在负温环境下的抗流挂性能均较好,可工作时间与流挂长度成正比关系;当环境温度高于结构拼接胶的适用温度时,会加快固化速率,缩短可工作时间,容易导致节段拼接性能有所损失甚至失效;当环境温度低于结构拼接胶的适用温度时,会减缓固化速率甚至不固化,影响施工进程,也易使节段发生硬接触而破坏;应结合风电混塔的实际施工环境条件选用合适的结构拼接胶。 Abstract: The research status of structural splicing adhesives was summarized, and the differences in technical requirements for structural splicing adhesives in existing relevant standards were compared. The anti-sagging performance and working time of four types of splicing adhesives used in wind power hybrid tower structures under negative temperature (-5 ℃) environment were studied. The results show that the anti-sagging performance of the four types of structural splicing adhesives is good in negative temperature environments, and the working time is proportional to the sagging length. When the ambient temperature is higher than the applicable temperature of structural splicing adhesive, it will accelerate the curing rate, shorten the working time, and easily lead to loss or even failure of segment splicing performance. When the ambient temperature is lower than the applicable temperature of structural splicing adhesive, it will slow down the curing rate or even not cure, affect the construction process, and easily cause hard contact and damage to the section. Suitable structural splicing adhesive should be selected based on the actual construction environment conditions of wind power hybrid towers.
李博洋,吴香国,张明熠,等.负温下风电混塔拼接胶的抗流挂性能和可工作时间研究[J].混凝土与水泥制品,2024(10):23-26,33. LI B Y,WU X G,ZHANG M Y,et al.Study on anti-sagging performance and working time of wind power hybrid tower splicing adhesive under negative temperature[J].China Concrete and Cement Products,2024(10):23-26,33.
横向拼接缝胶结缺陷对混塔极限状态受力特性的影响分析
横向拼接缝胶结缺陷对混塔极限状态受力特性的影响分析
  • 张宇豪1,2,吴香国1,3a,3b,*,张明熠4,5,高朝利2,周瑞权4,5,李博洋3a,3b,*
2024年第10期
摘要
引用本文
张宇豪,吴香国,张明熠,等.横向拼接缝胶结缺陷对混塔极限状态受力特性的影响分析[J].混凝土与水泥制品,2024(10):27-33. ZHANG Y H,WU X G,ZHANG M Y,et al.Analysis of the influence of transverse joint bonding imperfections on the ultimate state loading behaviors of hybrid towers[J].China Concrete and Cement Products,2024(10):27-33.
陆上风电混塔结构HSC/UHPC方案受力性能对比分析
陆上风电混塔结构HSC/UHPC方案受力性能对比分析
  • 高 鑫1,2a,2b,吴香国2a,2b,3,*,朱宏兵1,于 凯1,李博洋2a,2b,*
2024年第10期
摘要
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摘   要:传统的高强混凝土(HSC)和超高性能混凝土(UHPC)均可作为大型陆上风电混塔的主要结构材料,为进一步了解两种结构材料对混塔性能的影响,提出了HSC结构和UHPC结构混塔方案,并对比分析了两种结构混塔的受力特性和固有频率。结果表明:HSC结构和UHPC结构混塔在ULS(承载力极限状态)下的受弯承载力相差不大,但在SLS(正常使用极限状态)下的主压应力和FLS(疲劳极限状态)下的疲劳累计损失相差较大;HSC结构混塔的固有频率较高,超出了主机限值规定,需要采取额外的控制措施,而UHPC结构混塔的固有频率满足限值要求。 Abstract: The traditional high strength concrete (HSC) and ultra-high performance concrete (UHPC) can both be used as the main structural materials of hybrid towers for large-scale onshore wind turbine. In order to further investigate the influence of the two structural materials on the performance of hybrid towers, the schemes for hybrid towers of HSC structure and UHPC structure were put forward, and the stress characteristics and intrinsic frequency of hybrid towers of the two structures was comparatively analyzed. The results show that, there is a small difference between the ultimate bending bearing capacity of HSC structure and UHPC structure hybrid towers under ULS(ultimate limit state), but there is a significant difference between the main compressive stress under SLS(serviceability limit state) and the fatigue cumulative loss under FLS(fatigue limit state). The natural frequency of the HSC structure hybrid tower is higher, which exceeds the host limit regulations and requires additional control measures, while the natural frequency of the hybrid tower of UHPC structure meets the limit requirements.
高鑫,吴香国,朱宏兵,等.陆上风电混塔结构HSC/UHPC方案受力性能对比分析[J].混凝土与水泥制品,2024(10):34-39. GAO X,WU X G,ZHU H B,et al.Comparison analysis of stress performance of HSC/UHPC scheme for onshore wind turbine hybrid towers structure[J].China Concrete and Cement Products,2024(10):34-39.
西北地区强腐蚀环境高耐久性纤维增强混凝土技术研究
西北地区强腐蚀环境高耐久性纤维增强混凝土技术研究
  • 庞安宇,刘向坤*,张 伟
2024年第10期
摘要
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摘   要:针对西北地区核电工程恶劣环境,采用镁质抗蚀增强剂、水化热抑制剂、高性能复合矿物掺合料等制备了聚丙烯纤维增强C40高性能混凝土,研究了镁质抗蚀增强剂和水化热抑制剂对混凝土的工作性、力学性能和耐久性能的影响,并基于试验结果对纤维的最佳掺量进行了优选。结果表明:掺加水化热抑制剂和镁质抗蚀增强剂的混凝土具有良好的工作性,掺入不同掺量的纤维,混凝土的出机坍落度仍保持在160 mm以上,含气量在2.7%~4.2%之间;掺加水化热抑制剂和镁质抗蚀增强剂,混凝土的3 d抗压强度降低,7 d、28 d抗压强度提高,而随着纤维掺量的增加,混凝土的抗压强度提高;水化热抑制剂和镁质抗蚀增强剂的掺入可有效提高混凝土的抗氯离子渗透性能,掺入适量纤维可显著提高混凝土的抗氯离子渗透性能;水化热抑制剂和镁质抗蚀增强剂的掺入可提高混凝土的抗硫酸盐侵蚀性能,适量纤维的掺入也可提高混凝土的抗硫酸盐侵蚀性能;综合考虑工作性、力学性能和耐久性能,纤维推荐掺量为1.0 kg/m3。 Abstract: In response to  the harsh environment of nuclear power projects in the northwest region, polypropylene fiber reinforced C40 high performance concrete was prepared using magnesium based corrosion inhibitors, hydration heat inhibitors, high-performance composite mineral admixtures, etc. The effects of magnesium based corrosion inhibitors and hydration heat inhibitors on the workability, mechanical properties, and durability of concrete were studied, and the optimal fiber content was selected based on experimental results. The results show that the concrete with hydration heat inhibitor and magnesium corrosion inhibitor has good workability. When different contents of fibers are added, the slump of the concrete remains above 160 mm and the air content is between 2.7% and 4.2%. The addition of hydration heat inhibitor and magnesium based corrosion inhibitor reduces the compressive strength of concrete at 3 d, increases the compressive strength at 7 d and 28 d. With the increase of fiber content, the compressive strength of concrete increases. The addition of hydration heat inhibitors and magnesium based corrosion inhibitors can effectively improve the chloride ion penetration resistance of concrete, and the addition of appropriate contents of fibers can significantly enhance the chloride ion penetration resistance of concrete. The addition of hydration heat inhibitors and magnesium based corrosion inhibitors can improve the sulfate resistance of concrete, and the addition of appropriate contents of fibers can also enhance the sulfate resistance of concrete. Taking into account workability, mechanical properties, and durability, the recommended fiber content is 1.0 kg/m3.
庞安宇,刘向坤,张伟.西北地区强腐蚀环境高耐久性纤维增强混凝土技术研究[J].混凝土与水泥制品,2024(10):40-43,48. PANG A Y,LIU X K,ZHANG W.Study on high durability fiber reinforced concrete technology in strong corrosion environment in Northwest China[J].China Concrete and Cement Products,2024(10):40-43,48.
耐高温水泥基快中子屏蔽材料的制备与性能研究
耐高温水泥基快中子屏蔽材料的制备与性能研究
  • 李圆圆,吴 莹,潘小强,刘廷伟
2024年第10期
摘要
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摘   要:以氢氧化铝、碳化硼、铝酸盐水泥等为原材料,采用压制方法制备了高氢含量快中子屏蔽材料,研究了该屏蔽材料的密度、力学性能、耐高温性能、尺寸稳定性、屏蔽性能。结果表明:虽然密度不高,但所制备的屏蔽材料具有较好的力学性能、耐高温性能、尺寸稳定性好、屏蔽性能好,且成本低廉,具有较好的应用前景。 Abstract: A high hydrogen content fast neutron shielding material was prepared by pressing aluminum hydroxide, boron carbide, aluminate cement and other raw materials. The density, mechanical properties, high temperature resistance, dimensional stability, and shielding performance of the shielding material were studied. The results show that although the density of the prepared shielding material is not high, it has good mechanical properties, high temperature resistance, good dimensional stability, good shielding performance, and low cost, with good application prospects.
李圆圆,吴莹,潘小强,等.耐高温水泥基快中子屏蔽材料的制备与性能研究[J].混凝土与水泥制品,2024(10):44-48. LI Y Y,WU Y,PAN X Q,et al.Study on preparation and properties of high temperature resistant cement-based fast neutron shielding materials[J].China Concrete and Cement Products,2024(10):44-48.
核电工程用铁铝酸盐水泥高性能混凝土生产工艺研究
核电工程用铁铝酸盐水泥高性能混凝土生产工艺研究
  • 王宇平,高 铀,邱开建,刘向坤*
2024年第10期
摘要
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摘   要:基于铁铝酸盐水泥的性能特点,设计了强度等级为C35的铁铝酸盐水泥混凝土,并研究了混凝土搅拌时间、投料顺序对其工作性、抗压强度的影响。结果表明:随着搅拌时间的增加,混凝土的出机坍落度和出机扩展度均呈先增后降的趋势,各龄期抗压强度基本呈先增后降的趋势,且变化幅度较小;采用T1投料顺序生产的混凝土工作性、抗压强度较优;综合考虑工作性和抗压强度,建议C35铁铝酸盐水泥混凝土的搅拌时间为60 s,投料顺序为:碎石→砂→水泥(含粉煤灰)→水(含外加剂)。 Abstract: Based on the performance characteristics of ferro aluminate cement, ferro aluminate cement concrete with strength grade of C35 was designed, and the effects of mixing time and feeding sequence of concrete on its workability and compressive strength were studied. The results show that with the increase of mixing time, the slump and expansion of concrete show a trend of first increasing and then decreasing, and the compressive strength of each age shows a trend of first increasing and then decreasing basically, with a relatively small change amplitude. The concrete produced using T1 feeding sequence has better workability and compressive strength. Considering both workability and compressive strength, it is recommended that the mixing time for C35 ferro aluminate cement concrete is 60 s, and the feeding sequence is: gravel→sand→cement(including fly ash)→water(including admixtures).
王宇平,高铀,邱开建,等.核电工程用铁铝酸盐水泥高性能混凝土生产工艺研究[J].混凝土与水泥制品,2024(10):49-52. WANG Yuping, GAO You, QIU Kaijian,et al.Study on production technology of high performance concrete with ferro aluminate cement in nuclear power engineering[J].China Concrete and Cement Products,2024(10):49-52.

材性研究

高低温环境下混凝土有机-无机复合抗裂养护剂的制备及性能研究
高低温环境下混凝土有机-无机复合抗裂养护剂的制备及性能研究
  • 吉久发1,叶梦煊2,曹志国1,谷雷雷1,王倩倩2,*
2024年第12期
摘要
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摘   要:制备了适用于高低温环境的混凝土有机-无机复合抗裂养护剂(OICCA养护剂),研究了其对混凝土保水性能、力学性能及耐久性能的影响,并与两种市售养护剂(E-201、TSD)进行了对比,分析了其作用机理。结果表明:在40 ℃高温和-8 ℃低温环境下,与未涂覆养护剂的空白组相比,涂覆OICCA养护剂试件的抗裂性能显著提高;涂覆养护剂有效提高了混凝土的保水性能、力学性能及耐久性能;与E-201、TSD养护剂相比,OICCA养护剂的养护效果总体上相对较好;OICCA养护剂中的有机组分能使其成膜效果较好,无机组分能与水泥水化产物反应生成结晶物质密实孔隙,二者协同作用提升了混凝土的性能。 A concrete organic-inorganic composite anti-cracking curing agent(OICCA curing agent) suitable for high and low temperature environments was prepared. Its effects on the water retention, mechanical properties, and durability of concrete were studied, and compared with two commercially available curing agents(E-201, TSD) to analyze their mechanisms of action. The results show that under high temperature of 40 ℃ and low temperature of -8 ℃, compared with the blank group without coating curing agent, the crack resistance of OICCA curing agent coated specimens is significantly improved. The application of curing agents effectively improves the water retention, mechanical properties, and durability of concrete. Compared with E-201 and TSD curing agents, OICCA curing agent has a relatively better overall curing effect. The organic components in OICCA curing agent can achieve better film-forming effect, while the inorganic components can react with cement hydration products to form crystalline substances and compact pores. The synergistic effect of the two enhances the performance of concrete.
吉久发,叶梦煊,曹志国,等.高低温环境下混凝土有机-无机复合抗裂养护剂的制备及性能研究[J].混凝土与水泥制品,2024(12):1-8. JI J F,YE M X,CAO Z G,et al.Preparation and performance study of organic-inorganic composite anti-cracking curing agent for concrete in high and low temperature environments[J].China Concrete and Cement Products,2024(12):1-8.
水化热抑制剂对水泥-粉煤灰-矿粉复合胶凝材料水化反应的影响
水化热抑制剂对水泥-粉煤灰-矿粉复合胶凝材料水化反应的影响
  • 温东昌1,曾柯林1,杨 蓉2,王雷冲2,肖勋光2
2024年第12期
摘要
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摘   要:通过改变粉煤灰在矿物掺合料中的占比和水化热抑制剂(TRI)掺量,研究了TRI对水泥-粉煤灰-矿粉复合胶凝材料(复合胶材)水化过程和力学性能的影响,并通过测试TRI的吸附性能分析了其影响机理。结果表明:水泥对TRI的吸附能力最强,TRI虽能显著降低复合胶材早期水化放热速率峰值而不影响最终的水化程度,但会降低复合胶材的早期抗压强度;矿粉对TRI的吸附能力最弱,TRI对矿粉早期水化和火山灰反应的影响较小,且不影响其最终水化;粉煤灰对TRI的吸附能力相对较强,且TRI会严重影响粉煤灰的水化。 Abstract: The influence of hydration heat inhibitor(TRI) on the hydration process and mechanical properties of cement fly ash mineral powder composite cementitious materials(composite cementitious materials) was studied by changing the proportion of fly ash in mineral admixtures and the content of TRI added. The influence mechanism was analyzed by testing the adsorption performance of TRI. The results show that cement has the strongest adsorption capacity for TRI, which can significantly reduce the peak hydration heat release rate of composite cementitious materials in the early stage without affecting the final hydration degree, but will reduce the early compressive strength of composite cementitious materials. The adsorption capacity of mineral powder for TRI is the weakest, and TRI has little effect on the early hydration and volcanic ash reaction of mineral powder, and does not affect its final hydration. Fly ash has a relatively strong adsorption capacity for TRI, and TRI seriously affects the hydration of fly ash.
温东昌,曾柯林,杨蓉,等.水化热抑制剂对水泥-粉煤灰-矿粉复合胶凝材料水化反应的影响[J].混凝土与水泥制品,2024(12):9-13,28. WEN D C,ZENG K L,YANG R,et al.Effect of hydration heat inhibitor on the hydration reaction of composite cementitious materials with cement-fly ash-mineral powder[J].China Concrete and Cement Products,2024(12):9-13,28.
轻骨料预湿度对轻质UHPC性能及微观结构的影响
轻骨料预湿度对轻质UHPC性能及微观结构的影响
  • 鄢亦斌1,2,刘开志1,2,*,高立强1,2,彭嘉华1,2,郭凯正1,2,李 晨1,2
2024年第12期
摘要
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摘   要:研究了黏土陶砂预湿度(预湿水量分别为0、17.1、34.2 kg/m3)对轻质超高性能混凝土(LUHPC)工作性、力学性能、体积稳定性、抗氯离子渗透性能、抗盐雾侵蚀性能、抗低温性能和抗冻性能的影响,并分析了微观机理。结果表明:对黏土陶砂进行适当的预湿处理有助于改善LUHPC的工作性、力学性能、体积稳定性能、抗氯离子渗透性能、抗盐雾侵蚀性能、抗低温性能和抗冻性能;黏土陶砂预湿处理对LUHPC性能的提升主要归因于其优化了界面过渡区及改善了C-S-H凝胶结构。 Abstract: The effects of the pre-wetting degree of clay ceramic sand(pre-wetting water content was 0, 17.1 kg/m3, and 34.2 kg/m3, respectively) on the workability, mechanical property, volume stability, chloride ion penetration resistance, salt spray corrosion resistance, low temperature resistance, and frost resistance of lightweight ultra-high performance concrete (LUHPC) were investigated, and the micro-mechanisms were analyzed. The results show that, appropriate pre-wetting treatment of clay ceramic sand can help to improve the workability, mechanical property, volume stability, chlorine ion penetration resistance, salt spray corrosion resistance, low temperature resistance and frost resistance of LUHPC. The enhancement of LUHPC performance by the pre-wetting treatment of clay ceramic sand is attributed to the optimization of the interfacial transition zone and the improvement of the C-S-H gel structure.
鄢亦斌,刘开志,高立强,等.轻骨料预湿度对轻质UHPC性能及微观结构的影响[J].混凝土与水泥制品,2024(12):14-21. YAN Y B,LIU K Z,GAO L Q,et al.Effects of pre-wetting degree of lightweight aggregate on performance and microstructure of lightweight UHPC[J].China Concrete and Cement Products,2024(12):14-21.
SAP内养护再生粗骨料自密实混凝土的性能研究
SAP内养护再生粗骨料自密实混凝土的性能研究
  • 黄英杰1,张 萌1,*,曹建青2,甘诗腾1,刘睿智1,温 勇1
2024年第12期
摘要
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摘   要:研究了SAP掺量、再生粗骨料(RCA)取代率对自密实混凝土(SCC)工作性、力学性能和收缩性能的影响规律。结果表明:SAP对SCC工作性的影响不大,而RCA取代率对SCC工作性的影响较大;当SAP掺量一定时,SCC的坍落扩展度随RCA取代率的增加而降低;当SAP掺量一定时,SCC的抗压强度、劈裂抗拉强度随RCA取代率的增加而降低;当RCA取代率为75%、100%时,SCC的抗压强度、劈裂抗拉强度相对接近;SCC的劈裂抗拉强度发展速率随RCA取代率的增加而降低;与对照组相比,掺SAP及RCA的SCC的28 d自收缩均有显著降低;当SAP掺量一定时,SCC的自收缩随着RCA取代率的增加而降低;当RCA取代率一定时,SCC的自收缩基本随着SAP掺量的增加而降低。 Abstract: The influence of SAP dosage and recycled coarse aggregate(RCA) substitution rate on the workability, mechanical properties, and shrinkage performance of self-compacting concrete(SCC) was studied. The results show that SAP has little effect on the workability of SCC, while RCA substitution rate has a greater impact on SCC workability. When the SAP dosage is constant, the slump expansion of SCC decreases with the increase of RCA substitution rate. When the SAP dosage is constant, the compressive strength and splitting tensile strength of SCC decrease with the increase of RCA substitution rate. When the RCA substitution rate is 75% and 100%, the compressive strength and splitting tensile strength of SCC are relatively close. The development rate of splitting tensile strength of SCC decreases with the increase of RCA substitution rate. Compared with the control group, the 28 d self-shrinkage of SCC doped with SAP and RCA is significantly reduced. When the SAP  dosage is constant, the self-shrinkage of SCC decreases with the increase of RCA substitution rate. When the RCA substitution rate is constant, the self-shrinkage of SCC basically decreases with the increase of SAP dosage.
黄英杰,张萌,曹建青,等.SAP内养护再生粗骨料自密实混凝土的性能研究[J].混凝土与水泥制品,2024(12):22-28. HUANG Y J,ZHANG M,CAO J Q,et al.Study on the performance of SAP internal curing recycled coarse aggregate self-compacting concrete[J].China Concrete and Cement Products,2024(12):22-28.
膨胀剂对复掺粉煤灰及矿粉自密实混凝土性能的影响
膨胀剂对复掺粉煤灰及矿粉自密实混凝土性能的影响
  • 杨舜太1,吕永进2,杨 俊3,贺 勇1,*,王 聪3
2024年第12期
摘要
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摘   要:研究了膨胀剂掺量(0、8%、10%、12%)对复掺粉煤灰及矿粉自密实混凝土工作性、力学性能、体积稳定性和耐久性能的影响,并分析了作用机理。结果表明:膨胀剂的掺入降低了自密实混凝土的扩展度,当膨胀剂掺量在8%~12%范围内时,其对自密实混凝土扩展度的影响较小;掺入适量膨胀剂能有效提高自密实混凝土的抗压强度和限制膨胀率,降低干燥收缩值、碳化深度和电通量;膨胀剂能与水反应,生成膨胀性结晶水化物钙矾石,适量可提高基体的密实度,补偿混凝土硬化过程中的收缩。 Abstract: The effect of the content of expansion agent(0, 8%, 10% and 12%) on the workability, mechanical property, volume stability and durability of self-compacting concrete mixed with fly ash and slag was investigated, and the action mechanism was analyzed. The results show that, the incorporation of expansion agent reduces the slump-flow of self-compacting concrete, and when the content of expansion agent is 8%~12%, it has small effect on the slump-flow of self-compacting concrete. The incorporation of appropriate content of expansion agent can effectively improve the compressive strength and restricted expansion rate, and reduce the drying shrinkage value, carbonation depth and electric flux of self-compacting concrete. Expansion agent can react with water and generate expansive hydration product ettringite, which improves the matrix compactness and compensates the shrinkage of concrete during hardening.
杨舜太,吕永进,杨俊,等.膨胀剂对复掺粉煤灰及矿粉自密实混凝土性能的影响[J].混凝土与水泥制品,2024(12):29-32,46. YANG S T,LYU Y J,YANG J,et al.Effect of the expansion agent on the performance of self-compacting concrete mixed with fly ash and slag[J].China Concrete and Cement Products,2024(12):29-32,46.
水泥-石灰石粉胶凝材料体系水化放热规律研究
水泥-石灰石粉胶凝材料体系水化放热规律研究
  • 朱鹏飞1,2,余 熠1,*,石研然1,徐 菲1,何 旸1,蒋林华2,储洪强2,徐 宁1,徐天磊1
2024年第12期
摘要
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摘   要:研究了石灰石粉细度(比表面积分别为218、448、596 m2/kg)、水胶比(0.40、0.45、0.50)、水化温度(20 ℃、40 ℃)对胶凝材料体系水化进程的影响,并分析了石灰石粉的作用机理。结果表明:在20 ℃水化温度下,石灰石粉发挥填充、稀释、成核效应,随着石灰石粉掺量的增加,胶凝材料体系的水化放热速率峰值不断降低,诱导期结束时间基本提前;适当降低石灰石粉细度能促进胶凝材料体系的水化进程,但降低水胶比则起相反作用;适当升高水化温度可有效激发石灰石粉的水化活性,加速其火山灰效应,促进胶凝材料体系的水化进程。 Abstract: The effects of the fineness of limestone powder(specific surface area of 218, 448, 596 m2/kg, respectively), the water-binder ratio(0.40, 0.45, 0.50), and the hydration temperature(20 ℃, 40 ℃) on the hydration process of the cementitious material system were investigated, and the mechanism of the limestone powder was analyzed. The results show that, under the hydration temperature of 20 ℃, limestone powder plays the filling effect, dilution effect and nucleation effect, with the increase of the content of limestone powder, the peak value of the hydration exothermic rate of the cementitious material system decreases, and the terminal time of the induction period is basically in advance. Appropriate reduction of limestone powder fineness can promote the hydration process of cementitious material system, but reducing the water-binder ratio works in the opposite way. Appropriately elevating the hydration temperature can effectively stimulate the hydration activity of limestone powder, accelerate its volcanic ash effect, and promote the hydration process of cementitious material system.
朱鹏飞,余熠,石研然,等.水泥-石灰石粉胶凝材料体系水化放热规律研究[J].混凝土与水泥制品,2024(12):33-36. ZHU P F,YU Y,SHI Y R,et al.Study on the hydration exothermic law of cement-limestone powder cementitious material system[J].China Concrete and Cement Products,2024(12):33-36.
全固废超硫酸盐水泥稳定基层的配合比设计及施工过程质量控制
全固废超硫酸盐水泥稳定基层的配合比设计及施工过程质量控制
  • 王梦梦1,魏 力2,贾小龙1,3,4,李瑞杰2,5,万 磊3,陈浩旭3,4,马旭东3,4
2024年第12期
摘要
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摘   要:设计了全固废超硫酸盐水泥稳定材料的配合比,研究了其力学性能和耐久性能,并与水泥稳定材料进行了对比,提出了适用的施工过程质量控制方法。结果表明:制备的全固废超硫酸盐水泥稳定材料的无侧限抗压强度、抗压回弹模量、弯拉强度和间接抗拉强度均与水泥稳定材料的相当,抵抗干燥收缩的性能显著优于水泥稳定材料,这有利于实际工程中的裂缝控制;推荐采用硫酸盐SO3含量进行全固废超硫酸盐水泥稳定材料的施工过程质量控制。 The mix proportion of fully solid waste super sulfate cement stabilized material was designed, and its mechanical and durability properties were studied and compared with cement stabilized materials. Suitable construction process quality control methods were proposed. The results show that the unconfined compressive strength, compressive rebound modulus, flexural tensile strength, and indirect tensile strength of the prepared fully solid waste super sulfate cement stabilized material are comparable to those of cement stabilized material, and the resistance to drying shrinkage is significantly better than that of cement stabilized material, which is beneficial for crack control in practical engineering. It is recommended to use SO3 content in sulfate for construction process quality control of fully solid waste super sulfate cement stabilized materials.
王梦梦,魏力,贾小龙,等.全固废超硫酸盐水泥稳定基层的配合比设计及施工过程质量控制[J].混凝土与水泥制品,2024(12):37-41. WANG M M,WEI L,JIA X L,et al.Mix proportion design and construction process quality control of fully solid waste super sulfate cement stabilized base[J].China Concrete and Cement Products,2024(12):37-41.
污水处理池用大体积混凝土抗裂技术研究与应用
污水处理池用大体积混凝土抗裂技术研究与应用
  • 陈璋勇1,马 安1,汪 洋2
2024年第12期
摘要
引用本文
摘   要:为解决南通某污水处理池大体积混凝土易开裂的问题,通过优化配合比、掺入适量抗裂剂等措施设计了抗裂混凝土,研究了抗裂混凝土的抗压强度、绝热温升、自生体积变形,并对实体结构混凝土进行了现场温度、变形监测。结果表明:掺入适量抗裂剂并适当降低水泥用量能有效改善混凝土的绝热温升和自生体积变形,且对抗压强度无太大影响;监测段混凝土各结构部位的温峰在41.6~42.1 ℃范围内,最大温升值在21.2~22.1 ℃范围内,混凝土里表温差最大值为5.8 ℃;混凝土各结构部位的变形表现为持续膨胀;在整个监测期内,监测段混凝土未出现开裂。 Abstract: In order to solve the problem of easy cracking of mass concrete in a sewage treatment pond in Nantong, anti-cracking concrete was designed by optimizing the mix proportion and adding appropriate content of anti-cracking agent. The compressive strength, adiabatic temperature rise, and self-generated volumetric deformation of the anti-cracking concrete were investigated, and the temperature and deformation of the solid structural concrete were monitored on-site. The results show that, adding appropriate content of anti-cracking agent and appropriately reducing the content of cement can effectively improve the adiabatic temperature rise and self-generated volumetric deformation of concrete, and there is no great influence on the compressive strength. The peak temperature of each structural part of the concrete of the monitored section is in the range of 41.6~42.1 ℃, and the maximum value of temperature rise is in the range of 21.2~22.1 ℃, and the maximum value of temperature difference between the surface and the interior of the concrete is 5.8 ℃. The deformation of all structural parts of the concrete exhibits continuous expansion. Throughout the monitoring period, there is no occurrence of cracks in the concrete of the monitored section.
陈璋勇,马安,汪洋.污水处理池用大体积混凝土抗裂技术研究与应用[J].混凝土与水泥制品,2024(12):42-46. CHEN Z Y,MA A,WANG Y.Research and application of anti-cracking technology of mass concrete for sewage treatment pool[J].China Concrete and Cement Products,2024(12):42-46.
补偿收缩混凝土在某大型明挖穿湖隧道工程中的应用研究
补偿收缩混凝土在某大型明挖穿湖隧道工程中的应用研究
  • 王德民1,宋长清2,姚 军2,朱国军1,辜振睿1,舒震林1,张 港1
2024年第12期
摘要
引用本文
王德民,宋长清,姚军,等.补偿收缩混凝土在某大型明挖穿湖隧道工程中的应用研究[J].混凝土与水泥制品,2024(12):47-50. WANG D M,SONG C Q,YAO J,et al.Application research of shrinkage-compensating concrete in a large open-cut lake-crossing tunnel project[J].China Concrete and Cement Products,2024(12):47-50.
蒸养混凝土损伤及改善措施研究综述
蒸养混凝土损伤及改善措施研究综述
  • 金清平1,陈 祺1,刘 勇2,高永红1,张 曼2
2024年第12期
摘要
引用本文
摘   要:总结了蒸养混凝土的收缩开裂、热损伤、延迟钙矾石形成三种典型损伤类型,分析了损伤作用机理。并提出了改善蒸养混凝土损伤的措施:适量掺入矿物掺合料、优化蒸养制度、合理的后续补充养护、适量掺入内养护材料SAP等。 Abstract: Three typical types of damage, namely shrinkage cracking, thermal damage, and delayed formation of ettringite in steam curing concrete are summarized. The damage mechanism is analyzed, and improvement measures for steam curing concrete damage are proposed. Moderate addition of mineral admixtures, optimization of steam curing system, reasonable subsequent supplementary curing, and appropriate addition of internal curing material SAP can all improve the damage of steam curing concrete to a certain extent.
金清平,陈祺,刘勇,等.蒸养混凝土损伤及改善措施研究综述[J].混凝土与水泥制品,2024(12):51-56. JIN Q P,CHEN Q,LIU Y,et al.Current status on damage of steam curing concrete and its improvement measures[J].China Concrete and Cement Products,2024(12):51-56.

新能源水泥基制品

机制砂UHPC的性能及其在风电塔筒管片中的应用研究
机制砂UHPC的性能及其在风电塔筒管片中的应用研究
  • 宋秋磊1,2,骆静静1,2,李梦媛3,田 寅1,2,曹鑫铖1,2
2024年第10期
摘要
引用本文
摘   要:为拓展超高性能混凝土(UHPC)在风电塔筒管片上的应用,开展了机制砂UHPC在风电塔筒管片中的应用研究。结果表明:在颗粒级配近似替代的原则下,采用连续级配的机制砂可制备出性能优异的UHPC,蒸汽养护48 h后,机制砂UHPC的抗压强度约172.6 MPa,抗拉强度约9.99 MPa;采用机制砂UHPC制备风电塔筒管片,虽然其早期水化放热量较大(内部温度最高可达约80 ℃),但严格控制生产工艺,可使机制砂UHPC塔筒管片表面无裂缝及其他缺陷。 Abstract: To expand the application of ultra-high performance concrete(UHPC) on wind turbine tower tube segments, the application of manufactured sand in UHPC wind turbine tower segments was studied. The results show that under the principle of approximate substitution of particle size distribution, using continuously graded manufactured sand can prepare high performance UHPC. After steam curing for 48 h, the compressive strength of UHPC is about 172.6 MPa, and the tensile strength is about 9.99 MPa. Using UHPC with manufactured sand to prepare wind turbine tower tube segments, although its early hydration heat release is relatively large(the internal temperature can reach up to about 80 ℃). However, strict control of production processes can ensure that the surface of UHPC tower tube segments with manufactured sand is free of cracks and other defects.
宋秋磊,骆静静,李梦媛,等.机制砂UHPC的性能及其在风电塔筒管片中的应用研究[J].混凝土与水泥制品,2024(10):58-63. SONG Q L,LUO J J,LI M Y,et al.Study on the performance of UHPC with manufactured sand and its application in wind turbine tower segments[J].China Concrete and Cement Products,2024(10):58-63.
风力发电机组装配式预应力混凝土塔筒疲劳承载力分析
风力发电机组装配式预应力混凝土塔筒疲劳承载力分析
  • 张后禅,张 祥
2024年第10期
摘要
引用本文
摘   要:在设计使用年限内,风力发电机组装配式预应力混凝土塔筒的疲劳问题非常突出,尤其在塔筒1/2高度以上区域。国内标准的疲劳验算公式是基于等幅疲劳2×106次的试验研究结果,而风力发电机组混凝土塔筒的疲劳次数在3×108以上,故国内标准不适用风电机组混凝土塔筒的疲劳验算。而欧标Fib Model Code for Concrete Structures 2010(FIB规范)采用基于S-N曲线的Palmgren-Miner累积损伤方法进行混凝土疲劳验算,可以解决高次数的疲劳问题。介绍了FIB规范中混凝土塔筒常用的Ⅲ级和Ⅳ级设计方法,通过具体案例分析了混凝土塔筒疲劳承载力的影响因素。结果表明:提高混凝土强度等级和加大塔筒壁厚,可以有效提高塔筒的疲劳承载力。可为风力发电机组装配式预应力混凝土塔筒实际设计提供参考。 Abstract: During the design life, the fatigue of assembled prestressed concrete tower of wind turbine is very prominent, especially in the above 1/2 height of the tower. The fatigue checking formulas of domestic standards are based on the experimental results of 2×106 times of constant amplitude fatigue, and the fatigue times of the concrete tower of wind turbine are more than 3×108 , therefore the domestic standards are not applicable to the fatigue checking of the concrete tower of wind turbine. The fatigue checking method of Fib Model Code for Concrete Structures 2010(FIB specification) is based on Palmgren-Miner cumulative damage method and S-N curve, which can solve the high frequency fatigue problem. The commonly used Ⅲ level and Ⅳ level design method of concrete tower were introduced, and the influencing factors of fatigue capacity of concrete tower through examples were analyzed. The results show that increasing the concrete strength and increasing the thickness of tower wall can effectively improve the fatigue capacity. It can provide reference for the actual design of assembled prestressed concrete tower of wind turbine.
张后禅,张祥.风力发电机组装配式预应力混凝土塔筒疲劳承载力分析[J].混凝土与水泥制品,2024(10):64-67. ZHANG H C,ZHANG X.Fatigue capacity analysis of assembled prestressed concrete tower of wind turbine[J].China Concrete and Cement Products,2024(10):64-67.
环段吊装方案对风电混塔管片变形的影响分析
环段吊装方案对风电混塔管片变形的影响分析
  • 张宇豪1,2,吴香国1,3a,3b,*,陈发桥2,雍 飞2,高朝利2,李博洋3a,3b,*
2024年第10期
摘要
引用本文
摘   要:混凝土塔架采用预制管片通过水平和竖向节点组合而成,其组装需要现场进行吊装,吊装质量直接影响整塔的服役性能。在吊装方案中,吊钩吊点布置会导致管片受力存在差异。当环氧树脂结构胶尚未达到设计强度时,环段的整体性也未达到预期设计性态,管片起吊时由于重力影响而产生较大变形,严重时可能会导致管片的错台、崩边等工程质量问题。为了探究典型吊装工况对混塔吊装环段性态的影响,基于非线性有限元软件,以实际工程为背景,设计了3种不同的吊装工况(理想、工程、设计),研究了不同工况下混塔环段变形随吊装方式的影响。结果表明:通过调节各个吊带长度,将吊点处吊带沿多个方向布置,可使吊带内力均匀分布,从而减小管片的变形。 Abstract: The concrete tower is composed of prefabricated segments combined through horizontal and vertical joints, and its assembly requires on-site lifting. The lifting quality directly affects the service performance of the entire tower. In the lifting plan, the arrangement of hook lifting points may result in differences in the stress on the segments. When the epoxy resin structural adhesive has not yet reached the design strength, the overall integrity of the ring segment has not reached the expected design state. During the lifting of the segment, significant deformation may occur due to the influence of gravity, which may lead to engineering quality problems such as misalignment and edge collapse of the segment in severe conditions. In order to explore the influence of typical lifting conditions on the behavior of the hybrid tower lifting ring section, three different lifting cases(ideal, engineering, design) based on nonlinear finite element software and practical engineering background were designed, and the influence of the deformation of the hybrid tower ring section with the lifting solution under different working conditions were studied. The results show that by adjusting the length of each sling and arranging the sling along multiple directions at the lifting point, the internal force of the sling can be evenly distributed, thereby reducing the deformation of the pipe pieces.
张宇豪,吴香国,陈发桥,等.环段吊装方案对风电混塔管片变形的影响分析[J].混凝土与水泥制品,2024(10):68-72. WU X G,CHEN F Q,YONG F,et al.Analysis of the influence of ring lifting solution on the deformation of wind power hybrid tower segment[J].China Concrete and Cement Products,2024(10):[J].China Concrete and Cement Products,2024(10):68-72.
环形高强混凝土电杆设计方法及力学性能试验研究
环形高强混凝土电杆设计方法及力学性能试验研究
  • 韩 斐1,2,马建春1,2,李占岭1,2,袁 奔1,2,梁大鹏3
2024年第10期
摘要
引用本文
摘要:基于已发布实施的能源行业标准NB/T 11311—2023《环形截面混凝土电杆结构设计规程》有关高强混凝土电杆正截面受弯承载力、开裂弯矩、裂缝宽度、挠度的计算公式,对比研究了掺钢纤维、未掺钢纤维混凝土电杆的力学性能。基于结果,建议在工程计算时考虑钢纤维对混凝土电杆性能的影响,并通过试验来确定钢纤维对电杆性能的影响系数;另外,高强混凝土电杆具有占地少、施工方便、施工效率高等特点,在输配电线路中应用具有显著的技术、经济和社会效益。 Abstract: Based on the calculation formulas of bending bearing capacity of positive cross section, cracking moment, crack width, and deflection of high strength concrete poles contained in the published and implemented energy industry standard NB/T 11311—2023 Code for design of conerete pole structure with circular cross section, the mechanical properties of concrete poles with and without steel fibers are comparatively investigated. Based on the results, the effect of steel fiber on the performance of concrete poles is recommended to be considered in engineering calculations, and the influence coefficient of steel fiber on the performance of poles is determined through tests. In addition, the high strength concrete poles have the characteristics of occupying less land, convenient construction and high construction efficiency, and its application in transmission and distribution lines can generate significant technical, economic and social benefits.
韩斐,马建春,李占岭,等.环形高强混凝土电杆设计方法及力学性能试验研究[J].混凝土与水泥制品,2024(10):73-78. HAN F,MA J C,LI Z L,et al.Design method and experimental study on mechanical properties of high strength circular concrete poles[J].China Concrete and Cement Products,2024(10):73-78.

混凝土研究

改性纳米SiO2-苯丙乳液混凝土复合防护涂层的制备及性能研究
改性纳米SiO2-苯丙乳液混凝土复合防护涂层的制备及性能研究
  • 余茂林1,2,邓安仲2,沈海玉1,罗 盛2,*,杨艺斌1
2024年第11期
摘要
引用本文
摘   要:采用硅烷偶联剂KH560对纳米SiO2进行接枝改性,通过傅里叶红外变换光谱、热重分析及微观形貌分析等方法研究了KH560对纳米SiO2改性机理的影响,探究了改性SiO2-苯丙乳液复合涂层中掺入一定质量分数的改性纳米SiO2对混凝土抗硫酸盐溶液冻融性能的影响,并分析了改性纳米SiO2对苯丙乳液涂层的增强机理。结果表明:采用KH560改性后,纳米SiO2颗粒的团聚状态得到了显著改善,热稳定性提高;当改性纳米SiO2的质量分数为4%时,C4复合涂层对混凝土的防护作用最好,此时混凝土抗硫酸盐溶液冻融等级由F100~F150提升到F300以上;300次硫酸盐溶液冻融循环后,混凝土的质量损失率仅为0.35%,相对动弹性模量为96.2%,此时混凝土内部结构并未发生明显破坏。 Abstract: Modification of nano-SiO2 with KH560 silane coupling agent was studied by Fourier transform infrared spectroscopy, thermogravimetric analysis, and microscopic morphology analysis. The modification mechanism of nano-SiO2 with KH560 was explored. The influence of adding a certain mass fraction of modified nano-SiO2 on the freeze-thaw resistance of concrete against sulfate solution was investigated, and the strengthening mechanism of modified nano-SiO2 on styrene acrylic lotion coating was analyzed. The results show that after modification with KH560, the agglomeration state of nano-SiO2 particles is significantly improved, and the thermal stability is enhanced. When the mass fraction of modified nano-SiO2 is 4%, the C4 composite coating has the best protective effect on concrete, and the freeze-thaw resistance of concrete to sulfate solution is increased from F100~F150 to F300 or above. After 300 freeze-thaw cycles of sulfate solution, the mass loss rate of concrete is only 0.35%, and the relative dynamic modulus of elasticity is 96.2%. At this time, there is no significant damage to the internal structure of the concrete.
余茂林,邓安仲,沈海玉,等.改性纳米SiO2-苯丙乳液混凝土复合防护涂层的制备及性能研究[J].混凝土与水泥制品,2024(11):1-6 YU M L,DENG A Z,SHEN H Y,et al.Preparation and properties of modified nano-SiO2-styrene acrylic lotion composite protective coating for concrete[J].China Concrete and Cement Products,2024(11):1-6.
砂浆粗糙度对污水硫氧化细菌生物被膜特征的影响研究
砂浆粗糙度对污水硫氧化细菌生物被膜特征的影响研究
  • 陈晓庆1,荣 辉2,*,刘 鑫3,戴骁蒙3,许 伟1,龙武剑4,罗启灵4
2024年第11期
摘要
引用本文
摘   要:为分析粗糙度对硫氧化细菌生物被膜特征的影响,通过超景深显微镜、扫描电子显微镜、能谱仪、紫外分光光度计等表征方法,研究了污水环境中的硫氧化细菌在不同粗糙度砂浆试件表面形成生物被膜的宏观形貌、微观形貌、微生物数量、蛋白质含量及生物被膜厚度。结果表明:随着龄期的增加,试件粗糙度对硫氧化细菌生物被膜的宏观形貌、微观形貌及结构、生长脱落总周期影响不大,但会影响生物被膜的形成分布,粗糙度较大会延长生物被膜的黏附时间,并导致部分生物被膜提前脱落。 Abstract:  In order to analyze the influence of roughness on the biofilm characteristics of sulfur-oxidizied bacteria, the macroscopic and microscopic morphology, microbial quantity, protein content, and biofilm thickness of sulfur-oxidizied bacteria formed on the surface of mortar specimens with different roughness in sewage environment were studied using testing methods such as ultra depth of field microscope, scanning electron microscope, energy spectrometer, and ultraviolet spectrophotometer. The results show that as the age increases, the roughness has little effect on the macroscopic morphology, microscopic morphology and structure, as well as the total growth and shedding cycle of sulfur-oxidized bacterial biofilms. However, it can affect the formation and distribution of biofilms. Higher roughness prolongs the adhesion time of biofilms and leads to premature shedding of some biofilms.
陈晓庆,荣辉,刘鑫,等.砂浆粗糙度对污水硫氧化细菌生物被膜特征的影响研究[J].混凝土与水泥制品,2024(11):7-11,16. CHEN X Q,RONG H,LIU X,et al.The influence of mortar roughness on the biofilm characteristics of sewage sulfur-oxidized bacteria[J].China Concrete and Cement Products,2024(11):7-11,16.
纳米SiO2气凝胶水泥基复合材料中水的形态分布规律研究
纳米SiO2气凝胶水泥基复合材料中水的形态分布规律研究
  • 周 暘1,黄冬梅1,*,丰桢敏1,2,杨建红1
2024年第11期
摘要
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周暘,黄冬梅,丰桢敏,等.纳米SiO2气凝胶水泥基复合材料中水的形态分布规律研究[J].混凝土与水泥制品,2024(11):12-16. ZHOU Y,HUANG D M,FENG Z M,et al.Study on moisture morphology distribution of nano-SiO2 aerogel cement based composites[J].China Concrete and Cement Products,2024(11):12-16.
超高桥塔混凝土泵送性能优化试验研究
超高桥塔混凝土泵送性能优化试验研究
  • 黄 涛1,2,潘 利1,2,毛永琳1,2,徐 文1,2,*
2024年第11期
摘要
引用本文
摘   要:以常泰长江大桥工程为背景,采用一种基于流变仪摩擦计测试流变性能的试验方法,研究了水胶比、同胶凝材料总量、砂率对超高桥塔混凝土工作性及泵送性能的影响,并分析了泵管管径、泵送排量对泵送性能的影响。结果表明:适当提高水胶比、增加胶凝材料总用量、增加砂率均对改善混凝土的工作性与泵送性能有利;流变改性材料的掺入可大幅降低润滑层的黏度系数与混凝土的泵送阻力。 Abstract: Taking the Changtai Yangtze River Bridge project as the background, a test method based on rheometer friction meter was adopted to test rheological properties to study the effects of water-binder ratio, total amount of the same cementitious material, and sand ratio on the workability and pumpability of concrete for ultra high bridge towers. The influence of pump pipe diameter and pumping displacement on pumpability was also analyzed. The results indicate that appropriately increasing the water-binder ratio, total amount of cementitious materials, and sand ratio are all beneficial for improving the workability and pumpability of concrete. The addition of rheological modified materials can significantly reduce the viscosity coefficient of the lubricating layer and the pumping resistance of concrete. 
黄涛,潘利,毛永琳,等.超高桥塔混凝土泵送性能优化试验研究[J].混凝土与水泥制品,2024(11):17-21. HUANG T,PAN L,MAO Y L,et la.Experimental research on pumpability optimization for ultra high bridge tower concrete[J].China Concrete and Cement Products,2024(11):17-21.
骨料特征对水下不分散混凝土性能的影响
骨料特征对水下不分散混凝土性能的影响
  • 曾 涛,胡洪涛*,黄仁阔,于俊洋,肖雨欣
2024年第11期
摘要
引用本文
摘   要:利用分形理论结合图像处理方法对骨料的级配和粒形特征进行了定量评价,研究了不同分形维数下骨料特征对水下不分散混凝工作性、抗分散性能、力学性能、气泡特征、抗冻性能的影响。结果表明:随着级配分形维数的增加,水下不分散混凝土的工作性和抗压强度先提高后降低,抗分散性能提高,但抗冻性能降低,气泡间距系数与抗冻性能间存在良好的对应关系;当级配分形维数为2.5时,综合性能相对最佳;随着粒形分形维数的增加,水下不分散混凝土的工作性略有提高,但对抗分散性能、抗压强度、抗冻性能的提高效果不显著。 Abstract: A quantitative evaluation was conducted on the gradation and shape characteristics of aggregates using fractal theory combined with image processing methods. The effects of aggregate characteristics under different fractal dimensions on the workability, anti dispersion performance, mechanical performance, bubble characteristics, and frost resistance of underwater non-dispersed concrete were studied. The results show that as the fractal dimension of the gradation increases, the workability and compressive strength of underwater non-dispersed concrete first increase and then decrease, and the anti dispersion performance improves, but the frost resistance decreases. There is a good correspondence between the bubble spacing coefficient and the frost resistance. When the fractal dimension of the gradation is 2.5, the comprehensive performance is relatively optimal. As the fractal dimension of particle shape increases, the workability of underwater non-dispersed concrete slightly improves, but the improvement effect on anti dispersion performance, compressive strength, and frost resistance is not significant.
曾涛,胡洪涛,黄仁阔,等.骨料特征对水下不分散混凝土性能的影响[J].混凝土与水泥制品,2024(11):22-27. ZENG T,HU H T,HUANG R K,et al.Effect of aggregate characteristics on the performance of underwater non-dispersible concrete[J].China Concrete and Cement Products,2024(11):22-27.
外加剂及掺合料对透水混凝土强度与抗剥落性能的影响
外加剂及掺合料对透水混凝土强度与抗剥落性能的影响
  • 张 毅1,2,封仁博3,侯 芸1,*,杨 洁2,王 果2
2024年第11期
摘要
引用本文
摘   要:为提供透水混凝土的路面强度和耐久性能,研究了外加剂和掺合料对透水混凝土强度和耐久性能的影响,采用CT扫描技术,分析了不同材料对透水混凝土孔隙特征的影响,并总结孔隙特征与强度、抗剥落性能的关系。结果表明:不同材料会影响透水混凝土的孔隙特征,提高透水混凝土的强度,但均未见显著的相关性;不同材料的掺入可以提高透水混凝土的抗剥落性能,但提高的幅度不同,孔隙率对抗剥落性能有一定的影响,而孔隙数量和等效孔径基本无影响。 Abstract: To provide the strength and durability of pervious concrete pavement, the influence of additives and admixtures on the strength and durability of pervious concrete was studied. CT scanning technology was used to analyze the influence of different materials on the pore characteristics of pervious concrete, and the relationship between pore characteristics, strength, and anti-stripping performance was summarized. The results show that different materials can affect the pore characteristics of pervious concrete and improve its strength, but no significant correlation is observed. The addition of different materials can improve the anti-stripping performance of pervious concrete, but the degree of improvement varies. Porosity has a certain impact on the anti-stripping performance, while the number of pores and equivalent pore size have little effect.
张毅,封仁博,侯芸,等.外加剂及掺合料对透水混凝土强度与抗剥落性能的影响[J].混凝土与水泥制品,2024(11):28-35. ZHANG Y,FENG R B,HOU Y,et al.Influence of admixtures and additives on the strength and anti-stripping performance of pervious concrete[J].China Concrete and Cement Products,2024(11):28-35.
振动搅拌及水泥温度对混凝土凝结时间的影响
振动搅拌及水泥温度对混凝土凝结时间的影响
  • 尚庆芳,孔鲜宁,张梦荻,张良奇,黄凯强
2024年第11期
摘要
引用本文
摘   要:为了研究振动搅拌及水泥温度对混凝土凝结时间的影响,选取不同的搅拌方式(普通搅拌、振动搅拌)和水泥温度(常温、50 ℃、80 ℃)进行了混凝土的凝结时间试验。结果表明:相同搅拌方式下,随着水泥温度的升高,混凝土的凝结时间缩短;相同水泥温度下,振动搅拌混凝土的凝结时间比普通搅拌混凝土的凝结时间更短;当水泥温度在一定范围内时,振动搅拌对混凝土凝结时间的影响占主导作用;而当水泥温度较高(80 ℃)时,水泥温度对混凝土凝结时间的影响占主导作用;相比普通搅拌,振动搅拌可以使混合料颗粒充分分散,水泥颗粒分散均匀,加快水泥的水化速度,从而缩短混凝土的凝结时间。 Abstract: In order to study the effects of vibration mixing and cement temperature on the setting time of concrete, different mixing methods (ordinary mixing, vibration mixing) and cement temperatures (room temperature, 50 ℃, 80 ℃) were selected for concrete setting time tests. The results show that under the same mixing method, the setting time of concrete decreases with the increase of cement temperature. At the same cement temperature, the setting time of vibration mixing concrete is shorter than that of ordinary mixing concrete. When the temperature of cement is within a certain range, the influence of vibration mixing on the setting time of concrete is dominant. When the cement temperature is high (80 ℃), the influence of cement temperature on the setting time of concrete dominates. Compared with ordinary mixing, vibration mixing can fully disperse the particles of the mixture, evenly disperse the cement particles, accelerate the hydration rate of cement, thus shortening the setting time of concrete.
尚庆芳,孔鲜宁,张梦荻,等.振动搅拌及水泥温度对混凝土凝结时间的影响[J].混凝土与水泥制品,2024(11):36-38,42. SHANG Q F,KONG X N,ZHANG M D,et al.Influence of vibration mixing and cement temperature on setting time of concrete[J].China Concrete and Cement Products,2024(11):36-38,42.

水泥混凝土制品

预制UHPC雨污水检查井的设计与仿真分析
预制UHPC雨污水检查井的设计与仿真分析
  • 张书峰1,王 蕾1,许佳波2,*,范学明3,钟 诚1,田月强4
2024年第11期
摘要
引用本文
摘   要:为了解决传统混凝土雨污水检查井易出现病害(如井体开裂)的问题,提出了一种预制超高性能混凝土(UHPC)雨污水检查井。通过结构设计和仿真分析对预制UHPC雨污水检查井的性能进行了评估研究,并对其制作和运输方式进行了介绍。结果表明:UHPC雨污水检查井的性能指标满足相关规范要求,受力性能较好,制作和运输方便,可为后续预制UHPC雨污水检查井的设计与应用提供参考。 Abstract: In order to solve the problem of common diseases (such as cracking of the well body) in traditional concrete sewage inspection well, a prefabricated UHPC sewage inspection well was proposed. The performance of the prefabricated UHPC sewage inspection well was evaluated and studied through structural design and simulation analysis, and its manufacturing and transportation methods were introduced. The results show that the performance indicators of UHPC sewage inspection well meet the requirements of relevant specifications, with good stress performance and convenient production and transportation, which can provide reference for the design and application of prefabricated UHPC sewage inspection well in the future.
张书峰,王蕾,许佳波,等.预制UHPC雨污水检查井的设计与仿真分析[J].混凝土与水泥制品,2024(11):39-42. ZHANG S F,WANG L,XU J B,et al.Design and simulation analysis of prefabricated UHPC sewage inspection well[J].China Concrete and Cement Products,2024(11):39-42.
环氧树脂混凝土装配式桁架下弦K型节点力学试验及有限元分析
环氧树脂混凝土装配式桁架下弦K型节点力学试验及有限元分析
  • 谢新颖1,李晓峰1,金玉杰1,马杏梓2,华宇夫3
2024年第11期
摘要
引用本文
摘   要:通过静力试验研究了环氧树脂混凝土装配式桁架下弦K型节点的破坏形态、承载能力和节点板的应力与应变分布情况,并进行了有限元模拟分析。结果表明:环氧树脂混凝土下弦K型节点在下弦杆靠近节点板的两侧出现5条竖直裂缝,最终节点板左侧下弦杆处的竖直裂缝前后贯通,弦杆发生拉弯破坏,节点的极限承载力为421.5 kN;有限元模拟结果与试验结果吻合较好,验证了有限元模拟的可靠性。 Abstract: The failure mode, bearing capacity, and stress and strain distribution of K-type joint under chord of epoxy resin concrete prefabricated truss were studied through static tests, and the finite element simulation analysis was conducted. The results show that there are 5 vertical cracks on both sides of the lower chord of the epoxy resin concrete K-type joint near the joint plate. Finally, the vertical cracks at the lower chord on the left side of the joint plate penetrate forward and backward, and the chord undergoes tensile and bending failure. The ultimate bearing capacity of the joint is 421.5 kN. The finite element simulation results are in good agreement with the experimental results, verifying the reliability of the finite element simulation.
谢新颖,李晓峰,金玉杰,等.环氧树脂混凝土装配式桁架下弦K型节点力学试验及有限元分析[J].混凝土与水泥制品,2024(11):43 -48. XIE X Y,LI X F,JIN Y J,et al.Mechanical test and finite element analysis of K-type joint under chord of epoxy resin concrete prefabricated truss[J].China Concrete and Cement Products,2024(11):43 -48.

纤维材料及制品

基于机器学习的超高性能混凝土性能预测
基于机器学习的超高性能混凝土性能预测
  • 鄢亦斌1,2,刘开志1,2,*,高立强1,2,龙 勇1,2,李 晨2,费顺鑫3
2024年第11期
摘要
引用本文
摘   要:基于改进的Andreasen-Andersen(MAA)颗粒堆积模型设计了93组UHPC配合比,根据93组样本的抗压强度与流动度建立了数据库,采用线性回归模型、二次项回归模型、人工神经网络(ANN)模型预测了UHPC的流动度和28 d抗压强度,并使用遗传算法(GA)对ANN模型进行优化得到了GA-ANN模型,最后对比了四种模型的预测精度和稳定性。结果表明:四种模型对UHPC流动度和28 d抗压强度预测精度的高低顺序为GA-ANN模型>ANN模型>二次项回归模型>线性回归模型,其中,GA-ANN模型的R2分别达到了0.979和0.982。 Abstract:Based on the modified Andreasen-Andersen(MAA) particle accumulation model, 93 groups of UHPC proportions were designed, and a database was established based on the compressive strength and fluidity of the 93 groups of samples. Then the linear regression model, quadratic term regression model, and artificial neural network(ANN) model were used to predict the fluidity and the 28 d compressive strength of UHPC. And the genetic algorithm(GA) was used to optimize the ANN model to obtain the GA-ANN model. Finally, the prediction accuracy and stability of the four models were compared. The results show that, the order of accuracy of the four models in predicting the fluidity and 28 d compressive strength of UHPC is as follows: GA-ANN model > ANN model > quadratic term regression model > linear regression model, in which the R2 of the GA-ANN model reaches 0.979 and 0.982, respectively.
鄢亦斌,刘开志,高立强,等.基于机器学习的超高性能混凝土性能预测[J].混凝土与水泥制品,2024(11):49-53,59. YAN Y B,LIU K Z,GAO L Q,et al.Performance prediction of ultra-high performance concrete based on machine learning[J].China Concrete and Cement Products,2024(11):49-53,59.
环境温度对超高韧性地聚合物复合材料抗冲击性能的影响
环境温度对超高韧性地聚合物复合材料抗冲击性能的影响
  • 王圣怡1,2,李天歌1,周昱程1,2,3
2024年第11期
摘要
引用本文
摘   要:研究了不同NaOH溶液浓度(8、10、12、14 mol/L)的超高韧性地聚合物复合材料(UHTGC)在常温(20 ℃)、高温(50、100、200 ℃)、低温(-20、-40、-60 ℃)环境下的抗冲击性能。结果表明:在常温环境下,随着NaOH溶液浓度的增大,UHTGC试件的抗冲击性能呈先增后降的趋势,最佳NaOH溶液浓度为12 mol/L;在高温环境下,随着NaOH溶液浓度的增大,UHTGC试件的抗冲击性能不断提高,当NaOH溶液浓度为14 mol/L时,UHTGC试件的峰值冲击荷载和冲击耗能均相对最大;在低温环境下,随着NaOH溶液浓度的增大,UHTGC试件的峰值冲击荷载呈先增后降的趋势,冲击耗能呈增大趋势,另外,随着低温温度的降低,UHTGC试件的冲击耗能逐渐增大。 Abstract: The impact resistance of ultra-high toughness geopolymer composites(UHTGC) with different concentrations(8, 10, 12, 14 mol/L) of NaOH solution at room temperature(20 ℃), high temperature(50, 100, 200 ℃), and low temperature(-20, -40, -60 ℃) environments was investigated. The results show that, at room temperature environment, with the increase of the concentration of NaOH solution, the impact resistance of UHTGC specimens shows a tendency of first increasing and then decreasing, and the optimal concentration of NaOH solution is 12 mol/L. At high temperature environment, with the increase of the concentration of NaOH solution, the impact resistance of UHTGC specimens is improved, and when the concentration of NaOH solution is 14 mol/L, the peak impact load and impact energy consumption of UHTGC specimens are relatively largest. At low temperature environment, with the increase of the concentration of NaOH solution, the peak impact load of UHTGC specimen shows a tendency of first increasing and then decreasing, and the impact energy consumption of UHTGC specimen shows a tendency of increasing. In addition, with the decrease of the low temperature, the impact energy consumption of UHTGC specimen increase gradually.
王圣怡,李天歌,周昱程.环境温度对超高韧性地聚合物复合材料抗冲击性能的影响[J].混凝土与水泥制品,2024(11):54-59. WANG S Y,LI T G,ZHOU Y C.Effect of environmental temperature on the impact resistance of ultra- high toughness geopolymer composites[J].China Concrete and Cement Products,2024(11):54-59.
纳米纤维对钢纤维-UHPC基体界面黏结性能的影响
纳米纤维对钢纤维-UHPC基体界面黏结性能的影响
  • 吉世林
2024年第11期
摘要
引用本文
摘   要:研究了钢纤维(SF)埋置深度(5、10、15、20 mm)、碳纳米管(CNTs)掺量(0.1%、0.2%、0.3%、0.4%)、碳酸钙晶须(CAS)掺量(1%、2%、3%、4%)对SF-UHPC基体界面黏结性能的影响,并进行了微观机理分析。结果表明:随着SF埋置深度的增加,拉拔峰值荷载和SF-UHPC基体的拉拔能均呈增大趋势,但界面黏结强度呈降低趋势;CNTs的掺入虽降低了SF-UHPC基体的拉拔能,但适量CNTs可提升拉拔峰值荷载和SF-UHPC基体的界面黏结强度;掺入适量CAS可显著改善SF-UHPC基体的界面黏结性能;相较于CNTs,CAS对SF-UHPC基体界面黏结性能改善效果相对更好。 Abstract: The effects of the embedment depth(5, 10, 15, 20 mm) of steel fiber(SF), the content(0.1%, 0.2%, 0.3%, 0.4%) of carbon nanotube(CNTs) , and the content(1%, 2%, 3%, and 4%) of calcium carbonate crystal whisker(CAS) on the interfacial bonding performance of SF-UHPC matrix were investigated, and the micromechanisms analysis was conducted. The results show that, with the increase of the embedment depth of SF, the peak pull-out load and the pull-out energy of SF-UHPC matrix show an increasing trend, but the interfacial bonding strength shows a decreasing trend. Although the incorporation of CNTs reduces the pull-out energy of SF-UHPC matrix, the peak pull-out load and the interfacial bonding strength of SF-UHPC matrix can be improved with the appropriate content of CNTs. The incorporation of appropriate content of CAS can significantly improve the interfacial bonding performance of SF-UHPC matrix. Compared with CNTs, CAS has a relatively better improvement effect on the interfacial bonding performance of SF-UHPC matrix.
吉世林.纳米纤维对钢纤维-UHPC基体界面黏结性能的影响吉世林[J].混凝土与水泥制品,2024(11):60-64,69. JI S L.Effect of nano-fiber on interfacial bonding performance of steel fiber-UHPC matrix[J].China Concrete and Cement Products,2024(11):60-64,69.

房建材料及制品

应变硬化水泥基复合材料增强钢筋混凝土构件受弯性能试验研究
应变硬化水泥基复合材料增强钢筋混凝土构件受弯性能试验研究
  • 侯昌明1,张 朔1,陈 晓1,杨智峰1,张永兴2,*
2024年第11期
摘要
引用本文
摘   要:设计了1组钢筋混凝土梁构件(RC)和3组应变硬化水泥基复合材料增强钢筋混凝土梁构件(U-10、U-30、U-50),研究了应变硬化水泥基复合材料层厚度(0、10、30、50 mm)对构件受弯性能的影响。结果表明:与RC构件相比,U-10、U-30和U-50构件的承载能力分别提高了16.5%、34.8%和61.0%;在加载过程中,纵向钢筋先屈服,然后应变硬化水泥基复合材料增强层开始承担荷载,且增强层表面出现众多细小裂缝,此后,部分细小裂缝局部化,增强层韧性逐渐丧失,承载能力下降,并最终保持与钢筋混凝土基梁一致。 Abstract: One set of reinforced concrete beam components(RC) and three sets of strain hardened cementitious composite material strengthening reinforced concrete beam components(U-10, U-30, U-50) were designed, and the effects of strain hardened cementitious composite material layer thickness(0, 10, 30, 50 mm) on the bending performance of components were investigated. The results show that compared with RC components, the bearing capacity of U-10, U-30, and U-50 components are increased by 16.5%, 34.8%, and 61.0%, respectively. During the loading process, the longitudinal steel bars yield first, and then the strain hardened cementitious composite reinforcement layer begins to bear the load, and numerous small cracks appear on the surface of the reinforcement layer. Afterwards, some of the small cracks localize, and the toughness of the reinforcement layer gradually decreases, resulting in a decrease in bearing capacity and ultimately maintaining consistency with the reinforced concrete foundation beam.
侯昌明,张朔,陈晓,等.应变硬化水泥基复合材料增强钢筋混凝土构件受弯性能试验研究[J].混凝土与水泥制品,2024(11):65-69. HOU C M,ZHANG S,CHEN X,et al.Experimental study on bending performance of strain hardening cementitious composite material strengthening reinforced concrete components[J].China Concrete and Cement Products,2024(11):65-69.
纤维素醚对石膏基自流平砂浆性能的影响研究
纤维素醚对石膏基自流平砂浆性能的影响研究
  • 张明涛1,王泽萍1,唐 晗1,赵 敏2,*,李 鑫1,古富鹏1,张静文1
2024年第11期
摘要
引用本文
张明涛,王泽萍,唐晗,等.纤维素醚对石膏基自流平砂浆性能的影响研究[J].混凝土与水泥制品,2024(11):70-74. ZHNAG M T,WANG Z P,TANG H,et al.Study of the effect of cellulose ether on the properties of gypsum-based self-leveling mortar[J].China Concrete and Cement Products,2024(11):70-74.

标准解读

JC/T 2723—2022《预应力混凝土实心方桩》标准解读
JC/T 2723—2022《预应力混凝土实心方桩》标准解读
  • 蒋元海
2023年第4期
摘要
引用本文
为便于 JC/T 2723—2022《预应力混凝土实心方桩》的使用方准确理解标准条款的具体含义,正确贯彻实施标准条款的具体要求和规定,简述了该标准的编制背景、编制目的和意义,解释说明了标准条文的具体内容,并指出了标准实施过程中应注意的事项。 In order to facilitate the user of JC/T 2723—2022 Prestressed Concrete Solid Square Pile to accurately understand the specific meaning of the standard terms and correctly implement the specific requirements and provisions of the standard terms, the preparation background, purpose and significance of the JC/T 2723—2022 are briefly described, the specific contents of the standard provisions are explained in detail, and the problems that should be paid attention to in the implementation process are put forward.
蒋元海.JC/T 2723—2022《预应力混凝土实心方桩》标准解读[J].混凝土与水泥制品,2023(4):81-84. JIANG Y H.Interpretation on JC/T 2723—2022 Prestressed Concrete Solid Square Pile[J].China Concrete and Cement Products,2023(4):81-84.

检测及试验方法研究

灌浆料测强曲线对龄期与抗压强度的适用性研究
灌浆料测强曲线对龄期与抗压强度的适用性研究
  • 赵建华1,谢慧晟2,张建宇1,凌良建2,周红燕3,吕 嘉2
2023年第4期
摘要
引用本文
选择不同灌浆料制作了标准试件和模拟孔道PVC管试件,根据DB32/T 3754—2020《装配整体式混凝土结构检测技术规程》的要求,基于标准试件的抗压强度和模拟孔道PVC管试件的表面硬度建立了灌浆料测强曲线,分析了测强曲线对灌浆料龄期和抗压强度的适用性。结果表明:在灌浆料龄期≥14 d或抗压强度≥60 MPa的情况下,采用DB32/T 3754—2020中的方法建立的灌浆料测强曲线的适用性更强,可为实际工程中不同灌浆料实体抗压强度检测时间的选取提供参考。 Different sleeve grouting materials were selected to make standard test pieces and PVC pipe test pieces with simulated channels. According to the requirements of DB32/T 3754—2020 Technical Specification for Inspection of Monolithic Precast Concrete Structure, the strength curve of the grouting material was established based on the compressive strength of standard test pieces and the surface hardness of PVC pipe test pieces with simulated channels, and the applicability of the strength curve to the age and compressive strength was analyzed. The results show that when the age of grouting material is ≥14 days or the compressive strength of grouting material is ≥60 MPa, the strength test curve of grouting material established by the method in DB32/T 3754—2020 is more applicable, which can provide a reference for the selection of the testing time of the solid compressive strength of different grouting materials in practical projects.
赵建华,谢慧晟,张建宇,等.灌浆料测强曲线对龄期与抗压强度的适用性研究[J].混凝土与水泥制品,2023(4):85-87,92. ZHAO J H,XIE H S,ZHANG J Y,et al.Study on the Applicability of Grouting Material Strength Curve to Age and Compressive Strength[J].China Concrete and Cement Products,2023(4):85-87,92.

节能降碳

偏高岭土对碱矿渣水泥耐高温性能的影响
偏高岭土对碱矿渣水泥耐高温性能的影响
  • 吕淑莲1,雷 华2,程臻赟2,*
2024年第11期
摘要
引用本文
摘   要:对比研究了不同掺量的偏高岭土(0、10%、30%)对碱矿渣水泥在20~1 000 ℃高温作用下的外观形貌和抗压强度的影响,并进行了XRD、FT-IR和SEM分析。结果表明:当温度不大于400 ℃时,不同偏高岭土掺量试件的外观形貌和抗压强度均无明显变化;当温度升至600 ℃时,体系中的水化产物C-S-(A)-H凝胶脱水,试件内部结构出现微裂纹,抗压强度下降,但掺入适量偏高岭土能在一定程度上减少抗压强度损失;当温度达到1 000 ℃时,未掺偏高岭土试件的固相反应产物主要为钙黄长石晶体颗粒,且颗粒之间较为松散,微观结构密实度较低,而掺偏高岭土试件的固相反应产物主要为钠长石,微观结构呈空间网状,密实度较高,耐高温性能相对较好。 Abstract: A comparative study was conducted on the effects of different contents of metakaolin(0, 10%, 30%) on the appearance and compressive strength of alkali activated slag cement under high temperature conditions of 20~1 000 ℃, and XRD, FT-IR, and SEM analyses were conducted. The results show that when the temperature is not greater than 400 ℃, there is no significant change in the appearance and compressive strength of specimens with different metakaolin content. When the temperature rises to 600 ℃, the hydration product C-S-(A)-H gel in the system will be dehydrated, and the internal structure of the specimen will appear microcracks, reducing the compressive strength. However, the compressive strength loss can be reduced to a certain extent by adding appropriate content of metakaolin. When the temperature reaches 1 000 ℃, the solid reaction product of the specimen without metakaolin is mainly calcium feldspar crystal particles, and the particles are relatively loose with low microstructure density. On the other hand, the solid reaction product of the specimen with metakaolin is mainly sodium feldspar, with a spatial network structure, high density, and relatively good high temperature resistance.
吕淑莲,雷华,程臻赟.偏高岭土对碱矿渣水泥耐高温性能的影响[J].混凝土与水泥制品,2024(11):100-105. LYU S L,LEI H,CHENG Z Y.Effect of metakaolin on high temperature resistance of alkali activated slag cement[J].China Concrete and Cement Products,2024(11):100-105.
沙漠砂-粗骨料UHPC配合比设计及性能研究
沙漠砂-粗骨料UHPC配合比设计及性能研究
  • 马熙伦,罗 永,沙 东*,杨傲雄,唐梓轩
2024年第11期
摘要
引用本文
摘   要:采用沙漠砂和粗骨料复配大掺量替代石英砂制备了超高性能混凝土(UHPC),通过正交试验研究了水胶比(0.16、0.18、0.20)、沙漠砂掺量(20%、40%、60%)、钢纤维掺量(1%、2%、3%)和粗骨料掺量(10%、20%、30%)对UHPC流动性和抗压强度的影响,并与未掺沙漠砂和粗骨料的基准组进行了对比。结果表明:沙漠砂-粗骨料UHPC的最佳配合比组合为水胶比0.16、沙漠砂掺量40%、钢纤维掺量2%、粗骨料掺量20%,此时,UHPC试件的28 d抗压强度较基准组提高了5.8%,流动度较基准组降低了10.4%,但流动度仍满足相关规范要求。 Abstract: Ultra-high performance concrete(UHPC) was prepared by replacing quartz sand with a large amount of the combination of desert sand and coarse aggregates. The effects of water-cement ratio(0.16, 0.18, 0.20), desert sand content (20%, 40%, 60%), steel fiber content(1%, 2%, 3%), and coarse aggregate content(10%, 20%, 30%) on the flowability and compressive strength of UHPC were studied through orthogonal experiments, and compared with the reference group without desert sand and coarse aggregates. The results show that the optimal mix proportion combination of desert sand-coarse aggregate UHPC is the water-cement ratio of 0.16, desert sand content of 40%, steel fiber content of 2%, and coarse aggregate content of 20%. At this time, the 28 d compressive strength of UHPC specimens increases by 5.8% compared to the reference group, and the flowability decreases by 10.4% compared to the reference group, but the flowability still meets the requirements of relevant specifications.
马熙伦,罗永,沙东,等.沙漠砂-粗骨料UHPC配合比设计及性能研究[J].混凝土与水泥制品,2024(11):106-110. MA X L,LUO Y,SHA D,et al.Research on mix proportion design and performance of desert sand- coarse aggregate UHPC[J].China Concrete and Cement Products,2024(11):106-110.
再生微粉对再生混凝土力学性能的影响
再生微粉对再生混凝土力学性能的影响
  • 刘 诚1,2,白希选1,2,*,王相卿1,2
2024年第11期
摘要
引用本文
摘   要:研究了再生微粉等质量取代0、5%、10%、15%、20%的水泥对再生混凝土抗压强度,劈裂抗拉强度和弹性模量的影响,并进行了XRD和SEM分析。结果表明:随着再生微粉掺量的增加,试件各龄期的抗压强度、劈裂抗拉强度和弹性模量基本呈先增大后减小的趋势,最佳掺量为15%;再生微粉具有一定的火山灰活性和填充效应,适量掺入可以有效改善再生混凝土的界面过渡区结构,使其更加致密。 Abstract: The effects of replacing 0, 5%, 10%, 15%, and 20% cement with recycled powder on the compressive strength, splitting tensile strength, and elastic modulus of recycled concrete were studied, and the XRD and SEM analysis were conducted. The results show that with the increase of the content of recycled powder, the compressive strength, splitting tensile strength, and elastic modulus of the specimens at each age show a trend of first increasing and then decreasing, and the optimal content is 15%. Recycled powder has certain volcanic ash activity and filling effect, and moderate addition can effectively improve the interface transition zone structure of recycled concrete, making it denser.
刘诚,白希选,王相卿.再生微粉对再生混凝土力学性能的影响[J].混凝土与水泥制品,2024(11):111-114,120. LIU C,BAI X X,WANG X Q.Effects of recycled powder on mechanical properties of recycled concrete[J].China Concrete and Cement Products,2024(11):111-114,120.
建筑垃圾再生骨料的特性及改性方法研究进展
建筑垃圾再生骨料的特性及改性方法研究进展
  • 李克青1,齐国强1,曹芳菲2,刘学刚1,王富华1,吴譞1,刘晓坤1,王松魁1,张冀伟1
2024年第11期
摘要
引用本文
摘   要:从黏附砂浆、界面过渡区、裂纹损伤这3个方面介绍了建筑垃圾再生骨料(RCA)的特性,并分析了RCA对混凝土性能的影响。基于此,总结了近年来常见的建筑垃圾再生骨料改性方法,如酸化改性、化学浆液改性、纳米技术改性、碳化改性、微生物矿化改性、复合技术改性等,并分析了其改性机理,可为建筑垃圾资源化利用和再生骨料的性能提升研究提供参考。 Abstract: The characteristics of construction waste recycled aggregates(RCA) from the aspects of adhesive mortar, interface transition zone, and crack damage are introduced, and the influence of RCA on performance of concrete is analyzed. Based on this. The common modification methods of construction waste recycled aggregates in recent years are summarized, such as acidification modification, chemical slurry modification, nanotechnology modification, carbonization modification, microbial mineralization modification, composite technology modification, etc. The modification mechanism is analyzed, which can provide a reference for the resource utilization of construction waste and the performance improvement of recycled aggregates.
李克青,齐国强,曹芳菲,等.建筑垃圾再生骨料的特性及改性方法研究进展[J].混凝土与水泥制品,2024(11):115-12. LI K Q,QI G Q,CAO F F,et al.Research progress on characteristics and modification methods of construction waste recycled aggregates[J].China Concrete and Cement Products,2024(11):115-12.

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